题目内容
怎样简便就怎样算.
64.45-14.3-32.7
28×99-28×49
102×37
45×8×125.
64.45-14.3-32.7
28×99-28×49
102×37
45×8×125.
分析:(1)根据减法的性质简算;
(2)(3)根据乘法的分配律简算;
(4)根据乘法的结合律简算.
(2)(3)根据乘法的分配律简算;
(4)根据乘法的结合律简算.
解答:解:64.45-14.3-32.7
=64.45-(14.3+32.7)
=64.45-47
=17.45
28×99-28×49
=28×(99-49)
=28×50
=1400
102×37
=(2+100)×37
=2×37+100×37
=74+3700
=3774
45×8×125
=45×(8×125)
=45×1000
=45000.
=64.45-(14.3+32.7)
=64.45-47
=17.45
28×99-28×49
=28×(99-49)
=28×50
=1400
102×37
=(2+100)×37
=2×37+100×37
=74+3700
=3774
45×8×125
=45×(8×125)
=45×1000
=45000.
点评:本题考查了一些运算定律的灵活应用,要结合数据的特点选择合适的运算定律简算.
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