Mathematics
Senior High
どうして4段目で(2y-3)の前に-はつかないのですか？
符号の見分け方がわかりません、、。
x°+xy-2y°+x+11y-12
= x°+(y+1)xー(2y°-11y+12)
= x°+(y+1)x-(y-4)(2y-3)
= {x-(y-4)}{x+ (2y-3)}
(x-y+4)(x+2y-3)
三
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