用配方法解方程:(1)x²+(4根号2)-1=0(2)2x²-4=7x(3)4x²-12-1=0改一下(3)4x²-12x-1=0
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用配方法解方程:(1)x²+(4根号2)-1=0(2)2x²-4=7x(3)4x²-12-1=0改一下(3)4x²-12x-1=0
用配方法解方程:(1)x²+(4根号2)-1=0(2)2x²-4=7x(3)4x²-12-1=0
改一下(3)4x²-12x-1=0
用配方法解方程:(1)x²+(4根号2)-1=0(2)2x²-4=7x(3)4x²-12-1=0改一下(3)4x²-12x-1=0
(1)x^2+4√2x-1=0,x^2+4√2x+(2√2)^2-(2√2)^2-1=0,(x+2√2)^2=9,x1=3-2√2,x2=-3-2√2.
(2)2x^2-7x-4=0,2(x^2-7x/2)-4=0,2(x^2-7x/2+(7/4)^2-(7/4)^2)-4=0,2(x-7/4)^2-49/8-4=0,
2(x-7/4)^2=81/8,x1=7/4+9/4=4,x2=7/4-9/4=-1/2
(3)4(x^2-3x)-1=0,4(x^2-3x+(3/2)^2-(3/2)^2)-1=0,4(x-3/2)^2-9-1=0,x1=(3+√10)/2,x2=(3-√10)/2