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急急急,2.4x0.19+0.24x8.1简便运算脱式计算怎么...

=2.4×0.19+2.4×0.81 =2.4×(0.19+0.81) =2.4×1 =2.4

见图

原式 =(1.08÷0.27)x0.8 =4x0.8 =3.2

80/72

6.48÷[(1·4_0.8)x0.9] =6.48÷[(0.6x0.9] =10.8÷0.9 =12

1.25x0.7x0.8 =1.25x0.8x0.7 =1x0.7 =0.7

(1)3.09×99+3.09=3.09×(99+1)=3.09×100=309;(2)0.125×0.25×4×0.8=(0.125×0.8)×(0.25×4)=0.1×1=0.1;(3)1.25×7+1.25=1.25×(7+1)=1.25×8=10;(4)1.25×101=1.25×(100+1)=1.25×100+1.25=125+1.25=126.25.

(1.25十1.2)x8 =1.25×8+1.2×8 =10+9.6 =19.6

[(4.8-3.6)÷0.8-1]×0.09 =【1.2÷0.8-1】×0.09 =【2.25-1】×0.09 =1.25×0.09 =0.1125

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