题目内容
化简求值:x-(
x-
y2)+(-
x+
y2),其中x=
,y=-2.
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原式=x-
x+
y2-
x+
y2
=-x+y2
当x=
,y=-2时,
原式=-
+4=
.
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=-x+y2
当x=
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原式=-
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