Ujian nasional 2011 sebentar lagi !!..bagi kalian yang ingin melihat contoh-contoh soal ujian nasional matematika SMP, silahkan donlod melalui link dibawah ini. contoh contoh soalnya itu dari ebtanas tahun 2000-sampai Ujian Nasional tahun 2007.
Just for share. Not for sale....he he he...
DISINI DONLODNYA !!!!
TERIMAKASIH. SELAMAT BELAJAR MATEMATIKA....HE HE HE ~_~
Trik Menghitung Perkalian Bilangan mendekati 100. ( Recomended )
Berapakah hasil perkalian 98 x 97? atau 92 x 96? Apakah Anda masih menggunakan bantuan kalkulator untuk menghitungnya? He… he.. he… sekarang marilah kita sejenak tinggalkan kalkulator dan gunakan akal kita untuk menghitungnya. Kemampuan yang diberikan tuhan dalam diri kita ini ternyata lebih canggih daripada kalkulator. Lho kok bisa? Ya… dengan tips berikut ini dapat ditunjukkan bahwa hanya dalam hitungan detik kita bisa mencari hasil kali antara dua buah bilangan yang mendekati 100.
Perhatikan baik-baik video tips berikut ini dan praktekkan. Mudah-mudahan ada manfaatnya buat Anda.
LIHAT DISINI VIDEONYA.....................
Untuk sekedar mengecek saja, silakan dibandingkan hasil menggunakan tips di atas dengan hasil dari kalkulator.
Source : http://blog.rosihanari.net/trik-menghitung-perkalian-bilangan-mendekati-100-dalam-5-detik
Perhatikan baik-baik video tips berikut ini dan praktekkan. Mudah-mudahan ada manfaatnya buat Anda.
LIHAT DISINI VIDEONYA.....................
Untuk sekedar mengecek saja, silakan dibandingkan hasil menggunakan tips di atas dengan hasil dari kalkulator.
Source : http://blog.rosihanari.net/trik-menghitung-perkalian-bilangan-mendekati-100-dalam-5-detik
Trik Sulap Angka Joe Sandy
"Posting ini saya tulis bukan untuk mendiskreditkan Joe Sandy. Saya sama sekali tidak tahu apakah dalam show-nya di The Master Joe Sandy menggunakan trik, atau benar-benar menggunakan kekuatan pikiran"
Ok, ini adalah salah satu show yang sangat brilian dari Joe Sandy. Intinya, Joe membuat kotak 4x4, yang jika dijumlahkan :
-Secara Vertikal
-Secara horizontal
-Secara diagonal
-4 angka di masing-masing pojok
-4 angka di tengah
Akan menghasilkan angka yang sama.
Berikut rumusnya (sekali lagi,saya sama sekali tidak tahu apakah dalam show-nya di The Master Joe Sandy menggunakan trik, atau benar-benar menggunakan kekuatan pikiran):
Dan berikut contohnya, dengan angka 49 sebagai patokan (apabila dijumlahkan dengan metode di atas, semua menghasilkan 49)
Dalam show tersebut, Joe Sandy membuat kesalahan. Kesalahan itu bisa dimaklumi, karena ia berada di bawah pressure yang hebat.
Ok, daripada meributkan kesalahan dari Joe, mari kita tantang diri kita sendiri, seberapa cepat kita bisa menyelesaikan magic square ini. Persyaratannya :
- Angka total penjumlahan boleh anda pilih sendiri
- Tidak boleh ada dua angka yang sama muncul dalam tabel
- Dalam melakukannya, anda tidak boleh menggunakan dua angka total penjumlahan yang sama sama berturut-turut.
- Pembulatan dalam penghitungan waktu cukup satu angka di belakang koma, tidak termasuk waktu saat membuat tabel 4x4.
sumber : http://wikumagic.blogspot.com
Ok, ini adalah salah satu show yang sangat brilian dari Joe Sandy. Intinya, Joe membuat kotak 4x4, yang jika dijumlahkan :
-Secara Vertikal
-Secara horizontal
-Secara diagonal
-4 angka di masing-masing pojok
-4 angka di tengah
Akan menghasilkan angka yang sama.
Berikut rumusnya (sekali lagi,saya sama sekali tidak tahu apakah dalam show-nya di The Master Joe Sandy menggunakan trik, atau benar-benar menggunakan kekuatan pikiran):
Dan berikut contohnya, dengan angka 49 sebagai patokan (apabila dijumlahkan dengan metode di atas, semua menghasilkan 49)
Dalam show tersebut, Joe Sandy membuat kesalahan. Kesalahan itu bisa dimaklumi, karena ia berada di bawah pressure yang hebat.
Ok, daripada meributkan kesalahan dari Joe, mari kita tantang diri kita sendiri, seberapa cepat kita bisa menyelesaikan magic square ini. Persyaratannya :
- Angka total penjumlahan boleh anda pilih sendiri
- Tidak boleh ada dua angka yang sama muncul dalam tabel
- Dalam melakukannya, anda tidak boleh menggunakan dua angka total penjumlahan yang sama sama berturut-turut.
- Pembulatan dalam penghitungan waktu cukup satu angka di belakang koma, tidak termasuk waktu saat membuat tabel 4x4.
sumber : http://wikumagic.blogspot.com
Tesselation
Minggu, 03 Oktober 2010
A tessellation or tiling of the plane is a collection of plane figures that fills the plane with no overlaps and no gaps.
A dictionary* will tell you that the word "tessellate" means to form or arrange small squares in a checkered or mosaic pattern. The word "tessellate" is derived from the Ionic version of the Greek word "tesseres," which in English means "four." The first tilings were made from square tiles.
A regular polygon has 3 or 4 or 5 or more sides and angles, all equal. A regular tessellation means a tessellation made up of congruent regular polygons. [Remember: Regular means that the sides and angles of the polygon are all equivalent (i.e., the polygon is both equiangular and equilateral). Congruent means that the polygons that you put together are all the same size and shape.]
Example of regular tessellation :
There are also eight semi-regular tessellations which consist of two or more regular polygons which meet at each vertex and also do not overlap or leave gaps.
A Roman mosaic from Fishbourne Palace, EnglandThe original word tessellation comes from its use in art. From Ancient Greek a Tessera or Tessella is the small dice sized piece of stone used in mosaics. Therefore, as the dictionary suggests, the original tessellations were mosaics (right). Tessellations were first used in the form of mosaics in about 3000 BC in Ancient Mesopotamia. The tessellation in mosaics pertains to the actual structure of the arrangement of the small pieces of stone or tile, which is the regular tessellation of squares. Many of these mosaics not only had tessellations in their structure but the patterns were also those of tessellations.
One of the greatest practitioners of the use of tessellations in art was the Dutch graphic artist M. C. Escher (1898-1972). Although he is more famous for his drawings of the impossible, he also worked extensively on tessellations. Many of his works using tessellations consist not of a single repeated image, but of a smooth metamorphosing of one image into another. His 1938 lithograph, Sky and Water 1 (bottom right) is typical of his work. Since he started the trend many other artists have made similar tessellating art (bottom centre).
Sun and Moon by M. C. Escher
A tessellation of frogs on a sphere in the style of Escher
Sky and Water by M. C. Escher
Example of Tessellation in daily life :
A dictionary* will tell you that the word "tessellate" means to form or arrange small squares in a checkered or mosaic pattern. The word "tessellate" is derived from the Ionic version of the Greek word "tesseres," which in English means "four." The first tilings were made from square tiles.
A regular polygon has 3 or 4 or 5 or more sides and angles, all equal. A regular tessellation means a tessellation made up of congruent regular polygons. [Remember: Regular means that the sides and angles of the polygon are all equivalent (i.e., the polygon is both equiangular and equilateral). Congruent means that the polygons that you put together are all the same size and shape.]
Example of regular tessellation :
| a tessellation of triangles |  |
| a tessellation of squares |  |
| a tessellation of hexagons |  |
There are also eight semi-regular tessellations which consist of two or more regular polygons which meet at each vertex and also do not overlap or leave gaps.
There are an infinite number of tessellations which are made up of irregular shapes; these are known as non-regular tessellations.
On 3D surfaces such as the hyperbolic plane, spheres and tori, there are an infinite number of regular tessellations. For example, on the surface of a sphere, a pentagon can tessellate regularly. (The diagram above is shown as a disk on the Euclidean Plane, which leads to distortions.)
Tessellations in Art
A Roman mosaic from Fishbourne Palace, England
One of the greatest practitioners of the use of tessellations in art was the Dutch graphic artist M. C. Escher (1898-1972). Although he is more famous for his drawings of the impossible, he also worked extensively on tessellations. Many of his works using tessellations consist not of a single repeated image, but of a smooth metamorphosing of one image into another. His 1938 lithograph, Sky and Water 1 (bottom right) is typical of his work. Since he started the trend many other artists have made similar tessellating art (bottom centre).
Sun and Moon by M. C. Escher
A tessellation of frogs on a sphere in the style of Escher
Sky and Water by M. C. Escher
Example of Tessellation in daily life :
Langganan:
Postingan (Atom)
