Mathematics
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1回前に解いてできたのですが【(a+1)b+1】の1がどこから出てくるのかが分かりません。+(a-1)の+の1ですか?
(4) a²b+a-b-1 OXF
= (a² 1)b (α-1)
= (α-1xa+1b+(α-1)
〃
t
(a-1){(a+1)b+1}
= (a - ( ) (ab + b + 1)
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