题目内容

【题目】混合运算.

18÷÷ [4﹣(]×+×32

×+× +× 44﹣72×

【答案】(1)18÷÷

=30÷

=45;

(2)[4﹣(]×

=[4﹣]×

=×

=

(3)(+×32

=×32+×32

=24+20

=44;

(4)×+×

=×+

=×1

=

(5)+×

=+

=

(6)44﹣72×

=44﹣30

=14.

【解析】

试题分析:(1)按照从左向右的顺序进行计算;

(2)先算小括号里面的减法,再算中括号里面的减法,最后算乘法;

(3)、(4)根据乘法分配律进行简算;

(5)先算乘法,再算加法;

(6)先算乘法,再算减法.

解:(1)18÷÷

=30÷

=45;

(2)[4﹣(]×

=[4﹣]×

=×

=

(3)(+×32

=×32+×32

=24+20

=44;

(4)×+×

=×+

=×1

=

(5)+×

=+

=

(6)44﹣72×

=44﹣30

=14.

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