x^2+2xy-2xz-3y^2+2yz
=x^2+2xy—3y^2-2xz+2yz
=(x+3y)(x-y)-2z(x-y)
=(x-y)(x+3y-2z)
^2は2乗を表しています。
x^2+2xy-2xz-3y^2+2yz
=x^2+2xy—3y^2-2xz+2yz
=(x+3y)(x-y)-2z(x-y)
=(x-y)(x+3y-2z)
^2は2乗を表しています。
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