解方程:5x²-7x+2=0 2x²+3x-3=0
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解方程:5x²-7x+2=0 2x²+3x-3=0
解方程:5x²-7x+2=0 2x²+3x-3=0
解方程:5x²-7x+2=0 2x²+3x-3=0
1、
(5x-2)(x-1)=0
x1=2/5
x2=1
2、
2(x-3/4)^2-9/8-3=0
∴2(x-3/4)^2=33/8
∴(x-3/4)^2=33/16
∴x-3/4=±√33/4
∴x=(3±√33)/4