怎样简便就怎样算。52×28+52×70+61×2等于多少?

Question

如题所述

Answer 1

观察式子，可以把61拆成52+9
上式=52x28+52x70+（52+9）x2
=52x28+52x70+52x2+9x2
=52x（28+70+2）+18
=52x100+18
=5218

Answer 2

第一种是52×28 =(50±2)×28 = 50×28±2×28 = 1400±56 = 1456；第二种是52×28 = 52×(30-2)= 52×30-52×2 = 1560-104 = 1456。
52× 50 51 3.28× 34 1.72× 34-0.75× 5。

Answer 3

怎样简便就怎样算。
52×28+52×70+61×2
1） 提取公因子：
52×28+52×70+61×2
=52(28+70) + 61x2
=52x98+61x2
=52(100-2)+61x2
=5200-52x2+61x2
=5200+2(61-52)
=5200+2x9
=5200-18
=5182.
计算完毕。本回答被网友采纳