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2.2×0.25+2.8×0.25用简便计算

2.2×0.25+2.8×0.25 =0.25×(2.2+2.8) =0.25×5 =1.25

简便计算过程: 5.125×0.25+2.875÷4 =5.125×0.25+2.875×0.2

7.2×2.8+4×0.28

7.2÷0.25+2.8×4=40。 简便计算过程如下: 7.2÷0.25+2.8×4 =7.2×1

17.2÷2+2.8×0.5 =17.2x0.5+2.8x0.5 =(17.2+2.8)x0.5

原式=0.25×2.2+2.8 =0.25×5 =1.25

7.2÷0.25+2.8×4 =7.2x4+2.8x4 =(7.2+2.8)x4 =10x4

2.8x0.25+0.25 解: 原式= =0.25×(4x0.7)+0.25 =0.25x4x0

9.42+2.8÷0.25 = 9.42+2.8×4 = 9.42+11.2 = 20.62

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