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解下列方程:(1)x2+4x-5=0 (2)(2x-3)2-5(...

2(x-5)2-(x-5)=0,(x-5)(2x-10-1)=0,解得:x1=5,x2=112.(2)原方程可化为:(x-8)(x+4)=0,解得:x1=8,x2=-4.(3)原方程可化为:x2+6x+9-2x-5=0,(x+2)2=0,解得:x=-2.(4)原方程可化为:2x2-6x+x-3=-6,2x2-5x+3=0,解...

(1)原方程化为x 2 -4x=-1,配方,得x 2 -4x+4=-1+4,即(x-2) 2 =3,x-2=± 3 ,解得x 1 =2+ 3 ,x 2 =2- 3 ;(2)移项,得3(x-5) 2 +2(x-5)=0,提公因式,得(x-5)(3x-15+2)=0,解得x 1 =5,x 2 = 13 3 .

(1)原方程移项,得3(x-2)2-x(x-2)=0分解因式,得(x-2)(3x-6-x)=0解得:x1=2,x2=3;(2)原方程整理,得x2+5x-24=0分解因式,得(x+8)(x-3)=0解得:x1=-8,x2=3;(3)方程两边开平方,得3x-1=±2(2x+3)解得:x1=-7,x2=-57;(4...

(1)方程变形得:(x-2)2=4,开方得:x-2=2或x-2=-2,解得:x1=0,x2=4;(2)方程移项得:3(x-2)2-x(x-2)=0,分解因式得:(x-2)(2x-6)=0,解得:x1=2,x2=3;(3)分解因式得:(x-1)(x+5)=0,解得:x1=1,x2=-5;(4)方程变形得...

(1)把方程直接开平方得:x-5=±4,∴x 1 =-5-4=-9,x 2 =4-5=-1;(2)a=1,b=-4,c=1,∴x= -b± b 2 -4ac 2a = 4± 16-4 2 = 4± 2 3 2 =2± 3 ;(3)a=1,b=-4,c=5,∵△=b 2 -4ac=16-20=-4<0,∴次方程无解.(4)a=1,b=5,c=3,∴x= -b± b 2 -4...

(1)2x2-4x-3=0,2x2-4x=3,x2-2x=32,配方得:x2-2x+1=32+1,(x-1)2=52,开方得:x-1=±52,x1=1+102,x2=1-102. (2)x(2x+3)=5(2x+3),x(2x+3)-5(2x+3)=0,(2x+3)(x-5)=0,2x+3=0,x-5=0,x1=-32,x2=5.(3)x2-32x+2=0,b2-...

(1)分解因式得:(x-1)(x+5)=0,可得x-1=0或x+5=0,解得:x1=1,x2=-5;(2)分解因式得:(2x-5+x+4)(2x-5-x-4)=0,解得:x1=13,x2=9;(3)方程移项得:5(x+2)-4x(x+2)=0,分解因式得:(5-4x)(x+2)=0,解得:x1=54,x2=-2;...

(1)移项得,x2-4x=-3,x2-4x+4=-3+4,(x-2)2=1,x-2=±1,x1=3,x2=1;(2)移项得,2(x-3)2-x(x-3)=0,(x-3)(2x-6-x)=0x-3=0,或x-6=0,解得x1=3,x2=6;(3)a=2,b=3,c=-1,△=b2-4ac=9-4×2×(-1)=9+8=17,x=?b±b2?4ac2a=?3±174...

(4x-1)/3+(2x-2)/4=x/5 20(4x-1)+15(2x-2)=12x 80x-20+30x-30=12x 98x=50 x=50/98 x=25/49

3x²-1=0 3x²=1 x²=1/3 x=±√(1/3) x(2x+3)=5(2x+3) x=5 x²-4x-2=0 x²-4x+2-4=0 (x-2)²=4 x-2=±4 x=2±4 x1=6 x2=-2 2x²-5x+1=0 △=(-5)²-4×2×1=17 x=(5±√17)/(2×2) x1=(5...

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