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0.8除以1.25脱式计算

0.8÷1.25 =80÷125 =16/25

3,2÷o,8÷1,25=3,2

脱式计算 (1-0.8×1.25)÷0.01 =(1-1)÷0.01 =0÷0.01 =0

=0.8*(1.25*0.4+2.5*0.4)=0.8*(0.5+1)=(0.8*0.5+0.8*1)=0.4+0.8=1.2

1.25*(8+0.8) =1.25*8+1.25*0.8 =10+1 =11

0.91÷0.8+1.25×1.08 =0.91×1.25+1.25×1.08 =(0.91+1.08)×1.25 =1.99×1.25 =2.4875

39×1.25+ 0.8 =(40-1)x1.25+0.8 =40x1.25-1x1.25+0.8 =50-1.25+0.8 =50-1-0.25+0.8 =49+0.8-0.25 =49+0.55 =49.55 谢谢,请采纳

(1)1.25×(80+0.8),=1.25×80+1.25×0.8,=100+1,=101;(2)4.2×7.8+2.2×4.2,=4.2×(7.8+2.2),=4.2×10,=42;(3)4×6.33×0.5,=2×6.33,=12.66;(4)20.9+10.5÷(5.2-3.7),=20.9+10.5÷1.5,=20.9+7,=27.9;(5)21÷0.25÷0.4,=21÷...

4.2×(1.25乘以0.8) =4.2x(1.25x0.8) =4.2x1 =4.2

1.25x(0.4+0.8) =1.25×0.4+1.25×0.8 =0.5+1 =1.5

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