试题与答案

(1)解方程:10x+2=30x+7;(2)先化简,再求值:x2-2xx+1•(

题型:解答题

题目:

(1)解方程:
10
x+2
=
30
x+7

(2)先化简,再求值:
x2-2x
x+1
•(1+
1
x
)
,其中x=-2.

答案:

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凸透;一倍焦距和二倍焦距之间

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