题目内容
化简求值
x2-[2-(
x2+y2)]-
(-
x2+
y2),其中x=-2,y=-
.
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原式=
x2-2+
x2+y2+x2-
y2
=2x2+
y2-2,
当x=-2,y=-
时,原式=8+
-2=6
.
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=2x2+
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当x=-2,y=-
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