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1.25×0.7×0.8简便运算。

1.25*0.7*0.8=(1.25*0.8)*0.7=1*0.7=0.7

1.25*0.8*0.7=1*0.7=7

1.25*0.7*0.9*0.8=(1.25*0.8)*(0.7*0.9)=1*0.63=0.63

解:原式=(1.25x0.8)x0.7=1x0.7=0.7分析:主要考察结合律的运用.

原式=1.25*0.8*0.7=1*0.7=0.7

1.25x0.8X0.7

1.25*0.7*0.8=1.25*0.8*0.7=1*0.7=0.7

不用简便计算直接算

(1)1.25*0.7*0.8 =(1.25*0.8)*0.7=1*0.7=0.7(2)0.65*202 =0.65*(200+2)=0.65*200+0.65*2=130+1.3=131.3(3)1.25+4.6+0.75=(1.25+0.75)+4.6=2+4.6=6.6(4)6.1*3.6+3.6*3.9=(6.1+3.9)*3.6=10*3.6=36(5)16.8÷(7.34-6.54)=16.8÷0.8=21(6)2.7÷1.25÷8=2.7÷(1.25*8)=2.7÷10=0.27

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