hitunglah pengurangan berikut dengan cara susun panjang 72 - 63
Answer (3)
Fact #1: A cube has six faces.
Fact #2: Every one of them has the same area.
Fact #3: The surface area of each face is (the length of the cube's side)²
Now that I look at this one more carefully, the only thing you need to know to solve it is Fact #3. (But you can keep the others and save them for later.)
The surface area of each face is (the length of the cube's side)²
64 is the (length of the cube's side)²
Can you find a number that gives you 64 when you multiply it by itself ? That's the length of the cube's side.
Hint: If you don't get ' 8 ', work on it a little more.
The side length of a cube with a surface area of one face equal to 64 cm² is 8 cm. This is found using the formula for the area of a square: A = s 2 . By taking the square root of 64, we determine that s = 8 cm .
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Jawaban:Pengurangan 72 - 63 dengan cara susun panjang: 72- 63-------- 1. Kurangkan angka satuan: 2 - 3. Karena 2 lebih kecil dari 3, kita perlu meminjam 1 puluhan dari angka puluhan (7).- 7 menjadi 6 (karena kita meminjam 1 puluhan).- 2 menjadi 12 (karena kita menambahkan 1 puluhan yang dipinjam ke 2). Sekarang, kurangkan 12 - 3 = 9. Tulis 9 di kolom satuan. 6 12- 6 3--------- 9 2. Kurangkan angka puluhan: 6 - 6 = 0. Tulis 0 di kolom puluhan. 6 12- 6 3--------- 0 9 Jadi, hasil pengurangan 72 - 63 adalah 9.
