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四十乘八点二乘二点五脱式计算能简算的要简算

8.8×1.25 =1.1×(8×1.25) =1.1×10 =11 或者: 8.8×1.25 =(8+0.8)×1.25 =8×1.25+0.8×1.25 =10+1 =11

=42*2*25 =42*(2*25) =42*50 =2100

25×8×8×25×5=(25×8)²×5=(200)²×5=200000

(2/51+5/18)x9x17 =2/51x17x9+5/18x9x17 =2/3x9+5/2x17 =6+85/2 =6+42.5 =48.5

=2.8×10÷4 =28÷4 =7

5.2x9.8 =5.2x(10-0.2) =5.2x10-5.2x0.2 =52-1.04 =50.96

1.25×32×2.5 =(1.25×8)×(4×2.5) =10×10 =100 你好,本题已解答,如果满意 请点右上角“采纳答案”。

18乘括号1/2加1/3加2/9 =18乘(9/18加6/18加4/18) =18乘19/18 =19

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