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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 ...

(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)2.5×12.5×32=(2.5×4)×(12.5×8),=10×100,=1000;(2)6.4÷2.5÷0.4=6.4÷(2.5×0.4),=6.4÷1,=6.4;(3)5.4×0.36+0.64×5.4=5.4×(0.36+0.64),=5.4×1,=5.4;(4)9÷0.75+9÷0.25=12+36,=48;(5)17.2-0.71-0.29=17.2-(0.71+0.29...

1.9÷2.5÷0.4 =1.9÷(2.5Ⅹ0.4) =1.9÷1 =1.9

(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×...

(1)原式=2+5÷2.5=2+2=4;(2)原式=3 2 3 ÷11× 1 2 = 1 6 .

(1)10.5÷0.5×8=21×8=168(2)6.5÷O.4÷2.5=6.5÷(O.4×2.5)=6.5÷1=6.5(3)20.2×7.3-7.3×8.2=(20.2-8.2)×7.3=12×7.3=87.6(4)(10+0.1)×3.3=10×3.3+0.1×3.3=33+0.33=33.33

①9.1÷0.13÷2.5=70÷2.5=(70×4)÷(2.5×4)=280÷10=28②(74.8-20.2)÷91+0.4=54.6÷91+0.4=0.6+0.4=1③0.175÷0.25×4=0.7×4=2.8④7.44÷[(54.7-17.5)×0.5]=7.44÷[37.2×0.5]=7.44÷18.6=0.4

2.5=5/2----(÷5/2)=*(2/5) 0.4=2/5----(÷2/5)=*(5/2) 0.78÷2.5÷0.4=0.78÷5/2÷2/5=0.78*2/5*5/2==0.78

.5×8=3.6×0.4=39.68×0=47.6×1=4÷0.5=12÷0.06=12÷1.2=3÷30=0.15×7=3.2×6+3.2×4=2.5×4×0.36=0.2+0.8×0.5=6.03×1000=10×0.6=6.45×0.01=0.1×0.1=0.24×0.5=5.4+3.6=1.25-0.25=10.2×4.5=2.5×6=9×0.25=0.125×4=1.25×8×0.5=16×0.01=1.78÷0.3=0.27÷0...

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