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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)0.7+3.9+4.3+6.1=(0.7+4.3)+(3.9+6.1)=5+10=15;(2)56×99=56×(100-1)=56×100-56×1=5600-56=5544;(3)16÷2.5=16÷2.5÷4×4=16÷(2.5×4)×4=16÷10×4=1.6×4=6.4;(4)3.75×0.4+0.6×154=3.75×0.4+0.6×3.75=3.75×(0.4+0.6)=3.75×1=3....

(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)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...

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)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×(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...

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...

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