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4x^2+6x%3=0配方法解

(1)二次项系数化为1得,x你-33x-33=0,移项,得x你-33x=33,配方,得x你-33x+(你3)你=33+39,(x-你3)你=199,x-你3=±193,x1=你+193,x你=你?193.(你)移项得,(x+3)你-3(x+3)=0,提公因式得,(x+3)(x+3-3)=0,解得,x1=-3,x你...

(1)∵原方程可化为(2x-1)2=4,∴2x-1=±2,即x1=32,x2=-12;(2)∵原方程可化为-(x2-2x+1-1)+3=0,即-(x-1)2+4=0∴(x-2)2=4,解得x-2=±2,∴x1=4,x2=0;(3)∵一元二次方程x2-4x+2=0中,△=(-4)2-8=8,∴x=4±82=2±2,∴x1=2+2,x2=2-2;(...

解:(1)开方得:3x﹣1=2(x+2),3x﹣1=﹣2(x+2),3x﹣1=2x+2,3x﹣1=﹣2x﹣4,3x﹣2x=2+1,3x+2x=﹣4+1,解方程得:x 1 =3,x 2 =﹣ 。(2)分解因式得:(2x﹣1)(x﹣1)=0,2x﹣1=0,x﹣1=0,解得:x 1 = ,x 2 =1。(3)移项得:x 2 ...

(1)∵2x2-4x-6=0,∴x2-2x-3=0,∴x2-2x=3,∴(x-1)2=4,解得x1=3,x2=-1;(2)化简方程得,2y2+4y-4=0,∴a=2,b=4,c=-4,∴b2-4ac=48∴y=?4±484=-1±3,解得y1=?1+3,y2=?1?3.

(1)2x^2+x-1=0 (x+1)(2x-1)=0 x=-1或x=1/2 (2)2x^2=5x-2 2x^2-5x+2=0 (x-2)(2x-1)=0 x=2或x=1/2 (5)3x^2-5x+2=0 (x-2)(3x-1)=0 x=2或x=1/3 3和4不能用配方法啊

(1)∵x2-2x-1=0,∴x2-2x=1,∴x2-2x+1=2,∴(x-1)2=2,∴x-1=±2,解得:x1=1+2,x2=1-2;(2)∵2x2-7x+6=0,∴(2x-3)(x-2)=0,∴2x-3=0或x-2=0,解得:x1=32,x2=2;(3)∵4x(2x-3)=3-2x,∴4x(2x-3)+(2x-3)=0,∴(2x-3)(4x+1)=0,即2...

(1)3x2-4x=0,x(3x-4)=0,∴x1=0,x2=43;(2)2(x-3)2-(x+3)(x-3)=0,(x-3)(2x-6-x-3)=0,(x-3)(x-9)=0,∴x1=3,x2=9;(3)x2-12x=4,x2-12x+36=40,(x-6)2=40,x-6=±210,∴x1=6+210,x2=6-210;(4)a=5,b=-8,c=2,△=64...

答: 1) 4(x+1)²=k 2(x+1)=±√k x+1=±(√k) /2 x=-1±(√k) /2 2) 2x²+3x=1 2(x²+3x/2+9/4)=1+9/2 2(x+3/2)²=11/2 (x+3/2)²=11/4 x+3/2=±√11/2 x=(-3±√11)/2 3) 3x²-2=4x 3x²-4x=2 3(x²-4x/3+4/9)=2+4/3 3...

(1)25x2-36=0,分解因式得:(5x+6)(5x-6)=0,可得5x+6=0或5x-6=0,解得:x1=-65,x2=65;(2)(x+4)2=5(x+4),移项得:(x+4)2-5(x+4)=0,分解因式得:(x+4)(x-1)=0,可得x+4=0或x-1=0,解得:x1=-4,x2=1;(3)(x+3)2=(1-...

(1)移项得:x 2 -2x=24,配方得:x 2 -2x+1=24+1,(x-1) 2 =25,开方得:x-1=±5,解得:x 1 =6,x 2 =-4;(2)这里a=2,b=-4,c=-1,∵b 2 -4ac=(-4) 2 -4×2×(-1)=24,∴x= 4± 24 2×2 = 2± 6 2 ,∴x 1 = 2+ 6 2 ,x 2 = 2- 6 2 .

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