[(x+2y)²-(x+y)(x-y)-7y²】÷（2y）

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[(x+2y)²-(x+y)(x-y)-7y²】÷（2y）[(x+2y)²-(x+y)(x-y)-7y²】÷（2y）[(x+2y)²-(x+y)(x-

[(x+2y)²-(x+y)(x-y)-7y²】÷（2y）
[(x+2y)²-(x+y)(x-y)-7y²】÷（2y）

[(x+2y)²-(x+y)(x-y)-7y²】÷（2y）
原式=(x^2+4xy+4y^2-x^2+y^2-7y^2)/2y
=(4xy-2y^2)/2y
=2x-y

=(x^2+4xy+4y^2-x^2+y^2-7y^2)/2y
=(4xy-2y^2)/2y
=2y(4x-2y)/2y
=2(2x-y)

=[X2+4XY+4Y2- X2+ Y2-7 Y2]÷2y
=[-2 Y2+4XY]÷2y
=-y+2x