Mathematics
Senior High
Resolved
どこから-8が出てきたのか教えてください😭
(x+y−1)(x+y+3)-5=(x+y)²+2(x+y)-8
(A-D
={(x+y)-2}{(x+y)+4)
=(x+y−2)(x+y+4)
-A'+2
-(A-2
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