3-m2m-4÷(m+2-5m-2)．_爱下问搜题

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问题解答题

3-m

2m-4

÷(m+2-

5

m-2

)．

答案

原式=-

m-3

2(m-2)

÷

m2-4-5

m-2

=-

m-3

2(m-2)

•

m-2

(m+3)(m-3)

=-

1

2(m+3)

=-

1

2m+6

．

选择题

Don't shout at him. He _______. [ ]

A. will do his best

B. did well in

C. is good at

D. did his best

问答题

为什么提升机设减速警铃？