题目内容
【题目】若(x+y+z)(x-y+z)=(A+B)(A-B),且B=y,则A=_________________.
【答案】x+z
【解析】解:∵(x+y+z)(x﹣y+z)=(x+z+y)(x+z﹣y)=[(x+z)+y][(x+z)﹣y]=(A+B)(A﹣B).∵B=y,∴A=x+z.故答案为:x+z.
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题目内容
【题目】若(x+y+z)(x-y+z)=(A+B)(A-B),且B=y,则A=_________________.
【答案】x+z
【解析】解:∵(x+y+z)(x﹣y+z)=(x+z+y)(x+z﹣y)=[(x+z)+y][(x+z)﹣y]=(A+B)(A﹣B).∵B=y,∴A=x+z.故答案为:x+z.