cgl2008
幼苗
共回答了26个问题采纳率:84.6% 举报
y²-6y+6=0
y²-6y+9=3
(y-3)²=3
y-3=±√3
y=3±√3
5x²+13x-6=0
(5x-2)(x+3)=0
x=2/5或x=-3
3y²-2y-1=0
(3y+1)(y-1)=0
y=-1/3或y=1
x²-2√5x+5=0
(x-√5)²=0
x=√5
2x²-4x-3=0
2x²-4x+2=5
x²-2x+1=5/2
(x-1)²=5/2
x-1=±√10/2
x=1±√10/2
4x²-8x-5=0
4x²-8x+4=9
x²-2x+1=9/4
(x-1)²=9/4
x-1=3/2或x-1=-3/2
x=5/2或x=-1/2
1年前
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