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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)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...

原式=(2.5×4)×4.025 =10×4.025 =40.25

0.7×0.4×2.5=0.7×(0.4×2.5)=0.7×1=0.7 8.4×0.25=8×0.25+0.4×0.25=2+0.1=2.1 2.5×6.7×0.8=6.7×(2.5×0.8)=6.7×2=13.4 36×10.1=36×10+36×0.1=360+3.6=363.6 0.68×98=0.68×(100-2)=0.68×100-0.68×2=68-1.36=66.64 2.8×3.7+1.3×2.8=2.8×(3.7+1...

(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)32.5+3.6×2.5÷0.48,=32.5+9÷0.48,=32.5+18.75,=51.25;(2)22- 3 4 × 1 2 - 5 8 ,=22- 3 8 - 5 8 ,=22-( 3 8 + 5 8 ),=22-1,=21;(3)299÷(299+ 299 300 ),=299÷ 299×300+299 300 ,=299× 300 299×300+299 ,= 300 300+1 ,...

(1)2.5×(6+5×3.2)=2.5×(6+16)=2.5×22=55;(2)45×7.3+27×4.5=45×7.3+2.7×45=45×(7.3+2.7)=45×10=450; (3)5.8×101-5.8=5.8×(101-1)=5.8×100=580;(4)0.125×3.2×25=0.125×(8×0.4)×25=(0.125×8)×(0.4×25)=1×10=10;(5)[8.3...

我来

2.2×2.5+1.8×2.5 =2.5×(2.2+1.8) =2.5×4 =10

(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.

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