(2x+y)(2x-y)+(x+y)^2-2(2x^2 -xy〕.
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(2x+y)(2x-y)+(x+y)^2-2(2x^2-xy〕.(2x+y)(2x-y)+(x+y)^2-2(2x^2-xy〕.(2x+y)(2x-y)+(x+y)^2-2(2x^2-xy〕.(2x+
(2x+y)(2x-y)+(x+y)^2-2(2x^2 -xy〕.
(2x+y)(2x-y)+(x+y)^2-2(2x^2 -xy〕.
(2x+y)(2x-y)+(x+y)^2-2(2x^2 -xy〕.
(2x+y)(2x-y)+(x+y)^2-2(2x^2 -xy〕
=(2x+y)(2x-y)+(x+y)^2-2x(2x -y〕
=(2x+y)(2x-y)-2x(2x -y〕+(x+y)^2
=(2x+y-2x)(2x -y〕+(x+y)^2
=y(2x -y〕+(x+y)^2
=2xy-y^2+x^2+y^2+2xy
=4xy+x^2
=x(x+4y)
(x-y)(x-y)2(y-x) (x+2y-?)(x-2y+?)
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