作业帮用配方法,解下列方程x² 2x-3=0
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/29 21:27:25
解x²-2x=2x+1x²-4x=1x²-4x+4=5(x-2)²=5∴x-2=±√5∴x=2±√52x²+1=3x2x²-3x+1=0x&
3(x-2)²-6=0(x-2)²=2x-2=±√2X1=2+√2,X2=2-√2；3x²+1=-4x3x²+4x+1=0x²+4/3x+1/3=0（
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
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
2x²-5x=-3x²-5/2x=-3/2x²-5/2x+25/16=-3/2+25/16(x-5/4)²=1/16x-5/4=±1/4x₁=3/2
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^2-2x-5=0x^2-2x=5x^2-2x+1=6(x-1)^2=6x-1=±√6x1=√6+1x2=-√6+13x^2+2x-1=03x^2+2x=1x^2+2/3x=1/3x^2+2/3x+
答：3x2-2x-3=03x^2-2x-3=03(x^2-2x/3+1/9)-1/3-3=03(x-1/3)^2=10/3(x-1/3)^2=10/9x-1/3=±√10/3x=(1±√10)/3（2
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=
8x^2+2=4x8x^2-4x+2=04x^2-2x+1=0Δ=4-16
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
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
1.4x²-12x=14x²-12x+9=10(2x-3)²=102x-3=±√102x=3±√10x=(3±√10)/22．x(x+8)=16x²+8x-16
0.4x平方-0.8x=1两边同时乘以5得2x平方-4x=52x平方-4x+2=72(x平方-2x+1)=72(x-1)平方=7(x-1)平方=2分之7x-1=±2分之根号14x=1±2分之根号14x
(1)x^2-5x+6=0(x-5/2)²+6-25/4=0(x-5/2)²=1/4∴x-5/2=±1/2∴x1=5/2+1/2=3,x2=5/2-1/2=2(2)8x^2-2=4
再答：你上初三？
（2x-1）(x-1)=0∴x=1或