解方程 (1)x∧2-2x-3=0 (2) x∧2+4x+2=0 (3) x∧2-2x-2=0 (4) x∧2-6x-6=0 (5)x∧2-2x-1=0

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解方程 (1)x∧2-2x-3=0 (2) x∧2+4x+2=0 (3) x∧2-2x-2=0 (4) x∧2-6x-6=0 (5)x∧2-2x-1=0
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解方程 (1)x∧2-2x-3=0 (2) x∧2+4x+2=0 (3) x∧2-2x-2=0 (4) x∧2-6x-6=0 (5)x∧2-2x-1=0
解方程 (1)x∧2-2x-3=0 (2) x∧2+4x+2=0 (3) x∧2-2x-2=0 (4) x∧2-6x-6=0 (5)x∧2-2x-1=0

解方程 (1)x∧2-2x-3=0 (2) x∧2+4x+2=0 (3) x∧2-2x-2=0 (4) x∧2-6x-6=0 (5)x∧2-2x-1=0
(1)x∧2-2x-3=0
(x-3)(x+1)=0
x1=3,x2=-1
(2) x∧2+4x+2=0
(x+2)²=2
x+2=±√2
x1=-2+√2,x2=-2-√2
(3) x∧2-2x-2=0
(x-1)²=3
x-1=±√3
x1=1+√3,x2=1-√3
(4) x∧2-6x-6=0
(x-3)²=15
x-3=±√15
x1=3+√15,x2=3-√15
(5)x∧2-2x-1=0
(x-1)²=2
x-1=±√2
x1=1+√2,x2=1-√2