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標題:
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identities (without using caltor)
發問:
Without using calculator, calculate 1. 101^2-99^2 2. 1004*498 3. (√300+√3)(√300-√3) 4. 105^2+95^2
最佳解答:
1. 101^2-99^2 = (101 + 99)(101 - 99) = 400 2. 1004*498 = (1000 + 4)(1000 - 4)/2 = (10002 - 42)/2 = 499992 3. (√300+√3)(√300-√3) = 300 - 3 = 297 4. 105^2+95^2 = (100 + 5)2 + (100 - 5)2 = 1002 x 2 + 52 x 2 = 20000 + 50 = 20050
其他解答:63D0B758E2D502CC
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