先化简,再求值:13x2-(3x2+3xy-35y2)+(83x2+3xy+25

来源:www.tikuol.com 发布时间:2017-05-21 22:16
题型:解答题

问题:

先化简,再求值:
1
3
x2
-(3x2+3xy-
3
5
y2
)+(
8
3
x2
+3xy+
2
5
y2
),其中x=-
1
2
,y=2.

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