ldcf.net
当前位置:首页 >> 4x^2+6x%3=0配方法解 >>

4x^2+6x%3=0配方法解

(x-3)²+4x(x-3)=0 (x-3)[(x-3)+4x]=0 (x-3)(5x-3)=0 x1=3, x2=3/5 9(x-2)²=4(x+1)² 3(x-2)=2(x+1)或3(x-2)=-2(x+1) 3x-6=2x+2或3x-6=-2x-2 3x-2x=2+6或3x+2x=-2+6 x=8或x=4/5

(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...

(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)x2-4x-2=0,配方,得x2-4x+4-4-2=0,则x2-4x+4=6,所以(x-2)2=6,即x-2=±6.所以x1=6+2,x2=-6+2.(2)原方程变形得x2-2x=12,配方得x2-2x+(?22)2-(?22)2=12,即(x-1)2=13,所以x-1=±13.x1=1+13,x2=1-13.(运用配方法解形如x2+...

(1)(x+1)(2X-3)=1把括号打开并整理得2X^2-x-4=0;两边同时除以2得X^2-1/2X-2=0;配方得(x-1/4)^2=33/16, 这样就可以得出X了(2)2x^2+6=7X整理得2X^2-7X+6=0;两边同时除以2得X^2-7/2X+3=0;配方得(X-7/2)^2=1/16;同样可以求出X(3)(4)题似...

(1)y=2x2-4x-6=2(x2-2x+1)-2-6=2(x-1)2-8;(2)令x=0,得y=-6,令y=0,得2x2-4x-6=0,解得x=-1或x=3,则抛物线与x轴的交点为:(-1,0),(3,0);与y轴的交点为:(0,-6).由(1)题得:对称轴为x=1,顶点坐标为(1,-8),开口向上...

(1)x 2 -4x-2=0,配方,得x 2 -4x+4-4-2=0,则x 2 -4x+4=6,所以(x-2) 2 =6,即x-2=± 6 .所以x 1 = 6 +2,x 2 =- 6 +2.(2)原方程变形得x 2 -2x=12,配方得x 2 -2x+( -2 2 ) 2 -( -2 2 ) 2 =12,即(x-1) 2 =13,所以x-1=± 13 .x ...

网站首页 | 网站地图
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com