学宛新报 2010-2011学年人教课标版七年级第四十四期 七年级下车期末复习题《1》

apqueen2022-10-04 11:39:542条回答

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RACY2121 共回答了14个问题 | 采纳率92.9%
建议以后还是把题目发上来,否则像你现在这样提问是不可能得到解答的.
1年前
wangyouguo 共回答了23个问题 | 采纳率87%
题目是啥
1年前

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当a-b=2时,求(a-b)(a+b)(a-b)+ab(b-a)
将a-b=2换成a=2+b代入(a-b)(a+b)(a-b)+ab(b-a),
再把a-b=2换成b=a-2代入(a-b)(a+b)(a-b)+ab(b-a),
两式相等,加上已知条件a=2+b
就成了二元二次方程组
算出a等于多少,b等于多少,代入就可以求结果了.!
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