化简:
[3x2-2x(x+y)+y(2x-y)]÷(x+y)
=[x2-2x(x+y)+x2+2xy+y2+x2-2y2]÷(x+y)
=[x2-2x(x+y)+(x+y)2+x2-2y2]÷(x+y)
=[(x-(x+y))2+x2-2y2]÷(x+y)
=(x2-y2)÷(x+y)
=x-y
在将数据代入计算即可.
化简:
[3x2-2x(x+y)+y(2x-y)]÷(x+y)
=[x2-2x(x+y)+x2+2xy+y2+x2-2y2]÷(x+y)
=[x2-2x(x+y)+(x+y)2+x2-2y2]÷(x+y)
=[(x-(x+y))2+x2-2y2]÷(x+y)
=(x2-y2)÷(x+y)
=x-y
在将数据代入计算即可.