【x+3y】^2+[2x+6y][3y-4x]+[4x-3y]^2
=【x+3y】^2-2[x+3y][4x-3y]+[4x-3y]^2
=【(x+3y)-(3y-4x)】^2
=(-3x)^2
=9x^2
【x+3y】^2+[2x+6y][3y-4x]+[4x-3y]^2 分解因式
【x+3y】^2+[2x+6y][3y-4x]+[4x-3y]^2 分解因式
其他人气:436 ℃时间:2019-09-29 16:03:44
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