{6X+7y}+{6x+7y}+{6x+7y}2次方 等于
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{6X+7y}+{6x+7y}+{6x+7y}2次方等于{6X+7y}+{6x+7y}+{6x+7y}2次方等于{6X+7y}+{6x+7y}+{6x+7y}2次方等于{6X+7y}+{6x+7y}+
{6X+7y}+{6x+7y}+{6x+7y}2次方 等于
{6X+7y}+{6x+7y}+{6x+7y}2次方 等于
{6X+7y}+{6x+7y}+{6x+7y}2次方 等于
{6X+7y}+{6x+7y}+{6x+7y}2次方
=2(6x+7)+(6x+7y)^2
=(6x+7y)(6x+7y+2)
(6x+7y)(6x+7y+2)
36x^2+26XY+49Y^2+12X+14Y
合并=(7y+6x)(2+7y+6x)
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