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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;...

(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)9.1÷O.13÷2.5,=70÷2.5,=28;(2)40.5÷0.5+10.75,=81+10.75,=91.75;(3)0.4×[(0.75+0.65)÷0.56],=0.4×[1.4÷0.56],=0.4×2.5,=1;(4)7.9×(3.64÷2.6),=7.9×1.4,=11.06.

(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、0.65 2、16.44 3、52

(1)3.2×2.5×12.5,=4×0.8×2.5×12.5,=(4×2.5)×(0.8×12.5),=10×10,=100,(2)0.25÷(45+0.2)-14,=0.25÷1-14,=0.25-0.25,=0,(3)7÷〔411×(34+16)〕,=7÷[411×1112],=7÷13,=21,(4)5.7×0.25+6.8×25%-8.5×14,=5.7×0.25+6.8×0....

(1)144.15÷15.5÷0.03 =9.3÷0.03 =310;(2)39.22÷3.7×2.5=10.6×2.5=26.5;(3)106.02÷9.3-1.14=11.4-21.14=10.26;(4)6.12÷3.4÷2.5=1.8÷2.5=0.72;(5)9.36×9÷1.8=9.36×(9÷1.8)=9.36×5=46.8;(6)21.44÷3.2-1.8=6.7-1.8=4.9.

37.5+19.5÷2.5×4 =37.5+19.5×4÷2.5 =37.5+78÷2.5 =37.5+31.2 =68.7

①4×0.8×2.5×12.5,=(4×2.5)×(0.8×12.5),=10×10,=100;②(2.8+3.85÷3.5)×4.6,=(2.8+1.1)×4.6,=3.9×4.6,=17.94.

①68×35-40.8÷0.24=2380-170,=2210;②12.5×0.32×2.5=(12.5×0.8)×(0.4×2.5),=10×1,=10;③23×1213+23÷13,=23×1213+23×113,=23×(1213+113),=23×1,=23;④415×[78÷(34-25)],=415×[78÷720],=415×52,=23.

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