题目内容
【题目】能简算的要简算.
36.8﹣13.9﹣6.1 0.9×2+98×0.9 18.5×+18.5×
÷× (+﹣)×72 2.5×1.25×32
【答案】(1)36.8﹣13.9﹣6.1
=36.8﹣(13.9+6.1)
=36.8﹣20
=16.8
(2)0.9×2+98×0.9
=0.9×(2+98)
=0.9×100
=90
(3)18.5×+18.5×
=18.5×(+)
=18.5×1
=18.5
(4)÷×
=×2×
=
(5)(+﹣)×72
=×72+×72﹣×72
=66+20﹣21
=65
(6)2.5×1.25×32
=2.5×1.25×(4×8)
=(2.5×4)×(1.25×8)
=10×10
=100
【解析】
试题分析:(1)运用减法的性质简算;
(2)(3)(5)运用乘法分配律简算;
(4)把除法变为乘法,约分计算;
(6)把32看作4×8,再运用乘法交换与结合律进行简算.
解:(1)36.8﹣13.9﹣6.1
=36.8﹣(13.9+6.1)
=36.8﹣20
=16.8
(2)0.9×2+98×0.9
=0.9×(2+98)
=0.9×100
=90
(3)18.5×+18.5×
=18.5×(+)
=18.5×1
=18.5
(4)÷×
=×2×
=
(5)(+﹣)×72
=×72+×72﹣×72
=66+20﹣21
=65
(6)2.5×1.25×32
=2.5×1.25×(4×8)
=(2.5×4)×(1.25×8)
=10×10
=100
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