Mathematics
Senior High

(4)のやり方詳しく簡単にお願いします。

ちなみに答えは、(x-1)(y-1) です

(et) 2 (1) [共通因数でくくる] 次の式を因数分解せよ。 a(x-y)-b(x-y) 3675636 (3) (3a-b)x+(b-3a)y JRM (-3a+b) SX-E-4 (2) (a+b)x+y(a+b) (4) xy+1-x-y ES IN

Answers

xy+1-x-y =x(y-1)-(y-1) = (y-1)(x-1)

sa

y-1でくくってあげると自然とx-1がでてきます。

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