计算(3xx-2-xx+2)•x2-4x=______．_爱下问搜题

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问题解答题

计算(

3x

x-2

-

x

x+2

)•

x2-4

x

=______．

答案

(

3x

x-2

-

x

x+2

)•

x2-4

x

=

3x2+6x-x2+2x

x2-4

•

x2-4

x

=2x+8．故答案为2x+8．

选择题

As many as five courses are provided, and you are free to choose ________ suits you best.

A．whichever

B．whatever

C．whenever

D．wherever

判断题

女真在东北地区可以像游牧民族那样自由游走，因此各个部落间联系密切。