-3(x-y)²+7(x-y)+6(x-y)²
=(x-y)[-3(x-y)+7+6(x-y)]
=(x-y)(-3x+3y+7+6x-6y)
=(x-y)(3x-3y+7)
-3(x-y)的平方+7(x-y)+6(x-y)的平方
-3(x-y)的平方+7(x-y)+6(x-y)的平方
等于多少?重要的是 -3(x-y)的平方等于多少
等于多少?重要的是 -3(x-y)的平方等于多少
数学人气:322 ℃时间:2019-12-01 12:50:01
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