3x-2y-[4x+(y+3x)-(2x-3y)] 简化
4个回答
3x-2y-[4x+(y+3x)-(2x-3y)]
=3X-2Y-(4X+Y+3X-2X+3y)
=3X-2Y-4X-Y-3X+2X-3Y
=-2x-6y
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