用配方法解下列方程:x^2-5x-6=0-搜答案-智慧作业帮

《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

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

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+

(1)x²-5x+6=0x²-5x=-6x²-5x+25/4=-6+25/4(x-5/2)²=1/4x-5/2=±1/2x1=5/2+1/2=3x2=5/2-1

1、(a+0.25)²=9/16a+1/4=3/4或a+1/4=-3/4∴a=1/2a=-12、x²-6x+9=4(x-3)²=4∴x-3=2或x-3=-2∴x=5或x=

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

再答：采纳哦，亲

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

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