Mathematics
Senior High
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15はどのようにしたら出てきますか?
2
2
*(6) (x+y+1)(x+y-3)-12
(6) 5₁={(x+y)+1(x+y)-3) -12
01-
= (x + y)²-2(x+y) - 15
=
{(x+y)+3}{(x+y)-5}
= (x+y+3)(x+y-5)
5
33
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