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71.8 4 2.5用简便

原式=(0.4x2.5)x71.8=1x71.8=71.8供参考.

4.1*2.5=(4+0.1)*2.5=4*2.5+0.1*2.5=10+0.25=10.25

3.6乘4-2.5 等于3.6乘括号4-1 等于3.6乘3 等于10.8

2.5乘【33乘4.4】简便计算

4.4x2.5=4x2.5+0.4x2.5=10+1=11

71.4÷4÷2.8=71.4÷2.8÷4=(71.4÷0.7)÷(2.8÷0.7)÷4=102÷4÷4=25.5÷4=6.375

(74-3.6)/2.5/4 = 7.04

4.05X2.5X4=4.05X(2.5x4)=4.05x10=40.5这个是利用乘法结合律,25X4=100,2.5X4=10

(8.14-3.75)/2.5/4=(8.14-3.75)/(2.5*4)=(8.14-3.75)/10=(8.14-3.75)/10=4.39/10=0.439

由题意得2.4*2.5 =(2+0.4)*(2+0.5) =2*2+2*0.5+0.4*2+0.4+0.5 =4+1+0.8+0.2 =5+1 =6

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