用配方法解下列方程 x(x加4)等于8x加12-搜答案-大师作文网

《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-

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

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

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

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

(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

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

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？

1/4*x^2-x+1=0x^2-4x+4=0(x-2)(x-2)=0x1=x2=2（2x+1）^2=（1-3x）^24x^2+4x+1=9x^2-6x+15x^2-10x=0x^2-2x=0x(x-

（2x-1）(x-1)=0∴x=1或