Mathematics
Junior High

(9)の回答のx+y=Mにした後が理解できません。

(9)az-ay-baーby=a(ポージ)ー6(x+y)=a(z+y) (x-y)-6(x十y) z+y=Mとおくと, ar-ayy-bx-by=aM(z-y)-bM=M\a(z-y)一63 (x+y)(ax-ay-b) (10)-4.y+ 4y-3.x+6y=(z-2y)°-3(x-2y)
因数分解 数学 置き換えの因数分解 中3

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