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选择自己喜欢的方法,计算下面各题.12.5÷2.5÷0.4 ...

①12.5÷2.5÷0.4=12.5÷(2.5×0.4)=12.5÷1=1.25;②2.6×1.9÷2.6×1.9 =(2.6÷2.6)×(1.9×1.9)=1×3.61=3.61;③(7.7+1.54)÷0.7=9.24÷0.7=13.2;④10.8÷[(4.62-1.92)×4]=10.8÷[2.7×4]=10.8÷10.8=1;⑤3.8×6.7+3.3×3.8 =3.8×(6.7+3.3)=3.8×10=38;...

=12.5÷(2.5×0.4) =12.5÷1 =12.5

12.5✘(2.5✘0.4) =12.5✘1 =12.5

题干不详

(1)8.54÷2.5÷0.4=8.54÷(2.5×0.4)=8.54÷1=8.54;(2)(9.37+9.37+9.37+9.37)×2.5=9.37×4×2.5=9.37×(4×2.5)=9.37×10=93.7;(3)3.6×10.1-0.36=3.6×10.1-3.6×0.1=3.6×(10.1-0.1)=3.6×10=36;(4)2.22×9.9+6.66×6.7=2.22×3×3.3+6.66×6.7...

(1)23.8?79+6.2?119,=(23.8+6.2)-(79+119),=30-2,=28;(2)37.5+12.5÷2.5×4,=37.5+5×4,=37.5+20,=57.5;(3)(79+23×56)÷415,=(79+59)÷415,=43÷415,=5;(4)(517+413)×13×17,=517×13×17+413×13×17,=65+68,=133;(5)125×...

好的, 。

1.58÷12.5÷2.5÷6.4=0.0079 ~回答完毕~ ~\(^o^)/~祝学习进步~~~

x=5

(1)×;改正:2.5×0.4÷2.5×0.4=1÷2.5×0.4=0.4×0.4=0.16;(2)×;改正:12.5÷(25+0.5)=12.5÷25.5=2551.

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