(1)3x²-3根号3-6=0 (2)4x²-4x-5=0 (3)-3x²+7x-2=0
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(1)3x²-3根号3-6=0 (2)4x²-4x-5=0 (3)-3x²+7x-2=0
(1)3x²-3根号3-6=0 (2)4x²-4x-5=0 (3)-3x²+7x-2=0
(1)3x²-3根号3-6=0 (2)4x²-4x-5=0 (3)-3x²+7x-2=0
1、x²=√3+2
x²=(4+2√3)/2
x=(√6+√2)/2 x=-(√6+√2)/2
2、x²-x=5/4
x²-x+1/4=6/4
(x-1/2)²=6/4
x=1/2+√6/2 x=1/2-√6/2
3、-3x²+7x-2=0
3x²-7x+2=0
(3x-1)(x-2)=0
∴x=1/3 x=2