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下面各题,能用简便方法计算的用简便方法计算:2.5...

(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)2.5×125×4×0.8=(2.5×4)×(125×0.8)=10×100=1000;(2)73×59+73×49=73×(59+49)=73×1=73;(3)118÷[213×(14+56)]=118÷[213×1312]=118÷16=13.

=2.5×4×1.2=12 =2.5×4+2.5×0.4×2 =10+2=12

(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...

能简便的要简便计算 (8.14-3.74)÷2.5÷4 =4.4÷(2.5x4) =4.4÷10 =0.44

(1)3.045+2.7×6.9,=3.045+18.63,=21.675;(2)18.94-2.5×4,=18.94-10,=8.94;(3)3.65×2.8+3.65×7.2,=3.65×(2.8+7.2),=3.65×10,=36.5;(4)13.54×102-2×13.54,=13.54×(102-2),=13.45×100,=1345.

①2.5×1.25×8=2.5×(1.25×8)=2.5×10=25②9.7+22.78÷3.4=9.7+6.7=16.4③79.8÷5.7-4.5=14-4.5=9.5④0.86+0.86×99=0.86×(99+1)=0.86×100=86⑤8.6+1.4-5.26+1.74=(8.6+1.4)-5.26+1.74=10-5.26+1.74=4.74+1.74=6.48⑥(52-7.2÷3.6)×0.25=(52-2)×0.2...

(1)2.5×(3.8×0.04)=2.5×0.04×3.8=0.1×3.8=0.38;(2)7.69×101=7.69×(100+1)=7.69×100+7.69×1=769+7.69=776.69;(3)(8×5.27)×1.25=8×1.25×5.27=10×5.27=52.7;(4)0.125×72 =0.125×8×9=1×9=9;(5)1.2×0.25+2.8×0.25 =(1.2+2.8)×0...

(1)1.25×32×2.5=1.25×(8×4)×2.5=(1.25×8)×(4×2.5)=10×10=100(2) 3 4 + 1 4 × 4 7 = 3 4 + 1 7 = 25 28 (3)7.38-(1.57+2.38)=7.38-1.57-2.38=7.38-2.38-1.57=5-1.57=3.43(4) 9 10 + 9 10 ×99= 9 10 ×(1+99)=0.9×100=90(5) 1...

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