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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