Page 67 - Riyanto.Hitung Cepat

103 – 102 = 205
2
2
179 – 178 = 357
2
2
309 – 308 = 617
2
2

Penjelasan

a – b = (a + b)(a - b)
2
2
Jika a - b = 1 maka

a – b = (a + b)
2
2

Jika a - b = 2 maka

6 – 4 = (6 + 4)2 = 20
2
2
56 – 54 = (56 + 54)2 = 110
2
2
12 – 10 = (22)2 = 44
2
2
67 – 65 = (132)2 = 264
2
2
104 – 102 = (206)2 = 412
2
2

Jika a - b = 3 maka

7 – 4 = (7 + 4)3 = 33
2
2
13 – 10 = (23)3 = 69
2
2
68 – 65 = (133)3 = 399
2
2
105 – 102 = (207)3 = 621
2
2

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