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(1)
a -b ー -b²

b -a ー -a²
ーーーーーーー
ab ab -(a²+b²)

(2)
a -by ー -b²y

b ay ー a²y
ーーーーーーー
ab -aby² (a²-b²)y²

さー

X以外を係数として考えているということですか?

ととろ

そういうことです

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