下面各题,能用简便方法计算的用简便方法计算:2.5×12.5×32 6.4÷2.5÷0.4 5.4×0.36+0.64×5.4 9÷0.75+9÷0.25 17.2-0.71-0.29 8.6+1.4÷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), =17.2-1, =16.2; (6)8.6+1.4÷2.5 =8.6+0.56, =9.16. |
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