铁册恒载
幼苗
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=12/(m+3)(m-3)-2/(m-3)+1/(m+3)
=12/(m+3)(m-3)-2(m+3)/(m+3)(m-3)+(m-3)/(m+3)(m-3)
=(12-2m-6+m-3)/(m+3)(m-3)
=(-m+3)/(m+3)(m-3)
=-1/(m+3)
1年前
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7
阳光是刺
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问一下,y—x分之x的平方—y的平方能化简吗?化简后为多少
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铁册恒载
=(x+y)(x-y)/[-(x-y)] =-(x+y) =-x-y 请采纳