用配方法解下列方程x的平方 3=2倍的根号下3×x
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《1》3(x平方+2x+1)-6=03(x+1)平方-6=0【根号3(x+1)+根号6】【根号3(x+1)+根号6】=0x=正负根号2-1《2》方法同上【2(x-1/8)-四分之根号145】【2(x-
x^2+2*5*x+5^2-5^2+16=0(x+5)^2=9x+5=3或-3所以x=-2或x=-8
x^2+4X-3=0x^2+4x=3x^2+4x+(4/2)^2=3+(4/2)^2(x+2)^2=3+4=7x+2=±√7x=-2±√7x1=-2+√7x2=-2-√7
4x²-8x-3=04x²-8x=3x²-2x=3/4x²-2x+1=3/4+1(x-1)²=7/4x-1=±根7/2x=1±根7/2x1=1+(根7
(1)2x的平方+3=7x;2x²-7x+3=0(2x-1)(x-3)=0x1=1/2x2=3(2)2分之1x的平方-x-2分之3=0x²-2x-3=0(x-3)(x+1)=0x1
2x^2=3x-12x^2-3x+1=0(2x-1)(x-1)=0x1=1/2x2=1-3x^2+4x+1=03x^2-4x-1=03(x-2/3)^2-7/3=0x1=2/3+√7x2=2/3-√7
x²+6x-5=0x²+6x+9=5+9(x+3)²=14x+3=±√14x=-3±√142.(x+3)(x-3)=2x²-9=2x²=11x=±√1
很明显是B错了前面是2x^2,而后面只有x^2
2x²-6x=7x-6;2x²-13x+6=0;2(x²-13x/2)+6=0;2(x-13/4)²+6-169/8=0;2(x-13/4)²=121
(X+3)^2=(1-2X)^2(X+3)^2-(1-2X)^2=0(x+3+1-2x)(x+3-1+2x)=0(4-x)(3x+2)=0x1=4x2=-2/3
3x²+6x=1x²+2x=1/3x²+2x+1=1/3+1(x+1)²=4/3x+1=±2√3/3x=(-3-2√3)/3,x=(-3+2√3)/3
3x²+6x-5=03x²+6x=53(x²+2x)=53(x²+2x+1)=5+3=83(x+1)²=8x+1=2√2/3或x+1=-2√2/3x=
x²-x-3/4=0x²-x=3/4x²-x﹢(1/2)²=3/4+1/2(x-1/2)²=5/4x-1/2=正负2分之根号5∴x1=2分之根号5+1
原方程1为:2x²+3=5x2x²-5x+3=0x²-5/2x+(5/4)²=1/16(x-5/4)²=1/16x-5/4=±1/4x=5/4±1/4
答案是(x-9)(x+2)=0(x+1-根号6)(x+1+根号6)=0用求根公式(学过没?)(2x+1)(x+3)=0(3x+4)(2x-3)=0
4x^2-x-9=0x^2-1/4x=9/4x^2-1/4x+1/64=9/4+1/64(x-1/8)^2=145/64x-1/8=±√145/8x1=(1+√145)/8,x2=(1-√145)/8
1,x+5x+﹙5/2﹚-25/4-1=0﹙x+5/2﹚=29/4x=﹙√29-5﹚/4或x=-﹙√29+5﹚/42,提出2得------2﹙x-2x﹚-1=02﹙x-2x+1﹚-2-1=02﹙x-1
再答:你上初三?
(2x-1)(x-1)=0∴x=1或