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2y的2次方-y-二分之一=0用配方法

2025-03-21 15:59:43

推荐回答（2个）

回答1：

解：
2y∧2-y-1/2=0 ①
①÷2,得y∧2-y/2-1/4=0
y∧2-y/2+1/16=5/16
(y-1/4)∧2=5/16
y-1/4=±√5/4
y=(1±√5)/4
手机打的，看得懂吧。

回答2：

(y-1/2)(4y+1)

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