[其他] 手遮代值
老師秒殺的超快,遮一下答案就出來了
可是我還是不太懂原理
ex:
A B 1
______ + _____ = ___________
(2y-1) (y-1) (2y-1)(y-1)
A=-2 B=1
遮了之後要怎麼代入得到A,B答案 謝謝。
由於太簡單老師講超快
老師言:這樣蓋住 A就出來了 B也是
Os:別欺負基礎不好的...ㄒ_ㄒ
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