题目内容
【题目】能简算的要简算
××13×11 | (+)× | ×21+28× |
﹣× | [1﹣(+)]÷ | 99× |
【答案】10;3;13;;;5
【解析】
试题分析:(1)根据乘法交换律和结合律简算;
(2)根据乘法分配律简算;
(3)根据乘法分配律简算;
(4)先把化成×1,再根据乘法分配律简算;
(5)先算小括号里面的加法,再算中括号里面的减法,最后算括号的除法;
(6)先把99分解成98+1,再根据乘法分配律简算.
解答:解:(1)××13×11
=(×11)×(×13)
=10×1
=10
(2)(+)×
=×+×
=+1
=3
(3)×21+28×
=×(21+28)
=×49
=13
(4)﹣×
=×(1﹣)
=×
=
(5)[1﹣(+)]÷
=[1﹣]÷
=×4
=
(6)99×
=(98+1)×
=98×+1×
=5+
=5
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