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用简便方法计算下面各题 4.8×0.25 0.78×98 0.5×

4.8×0.25=(4+0.8)×0.25=4×0.25+0.8×0.25=1+0.2=1.2 0.78×98=0.78×(100-2)=0.78×100-0.78×2=78-1.56=76.44 0.5×2.33×8=(0.5×2)×4×2.33=1×4×2.33=9.32 1.5×105=1.5×(100+5)=1.5×100+1.5×5=150+7.5=157.5 0.3×2.5×0.4=(2.5×0.4 )×0.3=1×0...

4.8×0·25==4.8*1/4=1.20.78×98=0.78*(100-2)=78-1.56=76.440.5×2.33×8=2.33*4=9.321·5×105=1.5*(100+5)=150+7.5=157.50·3×2·5×0·4=0.3*1=0.31·2×2·5+0.8×2·5=2.5*(1.2+0.8)=2.5*2=5

0.4×9.2+0.4×0.8 =0.4×(9.2+0.8) =0.4×10 =4 0.78×102 =0.78×(100+2) =0.78×100+0.78×2 =78+1.56 =79.56 0.5×0.28+0.5×0.72 =0.5×(0.28+0.72) =0.5×1 =0.5

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