解方程 a²-8a-2=0 x²-6x+1=0 -y-2y+3=0
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解方程 a²-8a-2=0 x²-6x+1=0 -y-2y+3=0
解方程 a²-8a-2=0 x²-6x+1=0 -y-2y+3=0
解方程 a²-8a-2=0 x²-6x+1=0 -y-2y+3=0
a²-8a-2=0
a²-8a+16-18=0
(a-4)²=18
a-4=±3√2
a=4±3√2
a1=4+3√2 a2=4-3√2
x²-6x+1=0
x²-6x+9-8=0
(x-3)²=8
x-3=±2√2
x=3±2√2
x1=3+2√2 x1=3-2√2
-y-2y+3=0
-3y=-3
y=1
(第三题是不是错了?)