递等式计算(能简算的要简算)4÷(2.7×4) 0.4×1.43×2.5

1个回答

  • 解题思路:4÷(2.7×4)首先去括号,然后计算;

    0.4×1.43×2.5根据乘法交换律;

    7.95×101-7.95根据乘法分配律,提取7.95;

    175÷0.25÷0.4根据除以两个数等于除以这两个数的积,加括号;

    9.4×[0.96÷(5.4÷0.9)]先算小括号内的,再算中括号内的;

    52÷6.5+26×0.37,52=26×2,根据乘法分配律,提取26;即可得解.

    4÷(2.7×4)

    =4÷2.7÷4

    =1÷2.7

    =0.

    37

    0

    0.4×1.43×2.5

    =0.4×2.5×1.43

    =1×1.43

    =1.43

    7.95×101-7.95

    =7.95×(101-1)

    =7.95×100

    =795

    175÷0.25÷0.4

    =175÷(0.25×0.4)

    =175÷0.1

    =1750

    9.4×[0.96÷(5.4÷0.9)]

    =9.4×(0.96÷6)

    =9.4×0.16

    =1.504

    52÷6.5+26×0.37

    =26×(2÷6.5+0.37)

    =26×(0.31+0.37)

    =26×0.68

    =17.68

    点评:

    本题考点: 小数四则混合运算;整数四则混合运算;运算定律与简便运算.

    考点点评: 完成本题要注意分析式中数据,运用合适的简便方法计算.