解方程：2x^2=3x+2；0.25X^2+2.5x-6=0;(x+2)^2=6x+7;x^2-2根号3x-6=0

来源：学生作业帮助网编辑：作业帮时间：2024/05/05 15:09:03

解方程：2x^2=3x+2；0.25X^2+2.5x-6=0;(x+2)^2=6x+7;x^2-2根号3x-6=0
解方程：2x^2=3x+2；0.25X^2+2.5x-6=0;(x+2)^2=6x+7;x^2-2根号3x-6=0

解方程：2x^2=3x+2；0.25X^2+2.5x-6=0;(x+2)^2=6x+7;x^2-2根号3x-6=0
2x^2=3x+2
2x^2-3x-2=0
(2x+1)(x-2)=0
x=-1/2 或 x=2
2x^2=3x+2
x^2-3/2x-1=0
x^2-3/2x+(3/4)^2-(3/4)^2-1=0
(x-3/4)^2=25/16
x-3/4=5/4或x-3/4=-5/4
x=2或x=-1/2
0.25X^2+2.5x-6=0;
X^2+10x-24=0
(x-2)(x+12)=0
x=2 或x=-12
0.25X^2+2.5x-6=0;
X^2+10x-24=0
X^2+10x+25-25-24=0
(x+5)^2=49
x+5=7或x+5=-7
x=2 或x=-12
(x+2)^2=6x+7;
x^2+4x+4-6x-7=0
x^2-2x-3=0
(x-3)(x+1)=0
x-3=0或x+1=0
x=3 或x=-1
(x+2)^2=6x+7;
(x+2)^2-6(x+2)+5=0
((x+2)-5)((x+2)-1)=0
(x-3)(x+1)=0
x-3=0或x+1=0
x=3 或x=-1
x^2-2根号3x-6=0
x^2-2根号3x+3-3-6=0
(x-根号3)^2=9
x-根号3=3或x-根号3=-3
x=3+根号3 或x=-3+根号3
x^2-2根号3x-6=0
x^2-2根号3x+3-3-6=0
(x-根号3)^2=9
x-根号3=3或x-根号3=-3
x=3+根号3 或x=-3+根号3
x^2-2根号3x-6=0
用公式法解得
x=(2根号3+根号12+4*1*6)/2=3+根号3
或x=(2根号3-根号12+4*1*6)/2=-3+根号3

晕死，看教科书例题啊！！

2x^2=3x+2
2x^2-3x-2=0
(2x+1)(x-2)=0
x=-1/2 或 x=2
2x^2=3x+2
x^2-3/2x-1=0
x^2-3/2x+(3/4)^2-(3/4)^2-1=0
(x-3/4)^2=25/16
x-3/4=5/4或x-3/4=-5/4
x=2或x=-1/2
0.25X^2+2.5...

全部展开

2x^2=3x+2
2x^2-3x-2=0
(2x+1)(x-2)=0
x=-1/2 或 x=2
2x^2=3x+2
x^2-3/2x-1=0
x^2-3/2x+(3/4)^2-(3/4)^2-1=0
(x-3/4)^2=25/16
x-3/4=5/4或x-3/4=-5/4
x=2或x=-1/2
0.25X^2+2.5x-6=0;
X^2+10x-24=0
(x-2)(x+12)=0
x=2 或x=-12
0.25X^2+2.5x-6=0;
X^2+10x-24=0
X^2+10x+25-25-24=0
(x+5)^2=49
x+5=7或x+5=-7
x=2 或x=-12
(x+2)^2=6x+7;
x^2+4x+4-6x-7=0
x^2-2x-3=0
(x-3)(x+1)=0
x-3=0或x+1=0
x=3 或x=-1
(x+2)^2=6x+7;
(x+2)^2-6(x+2)+5=0
((x+2)-5)((x+2)-1)=0
(x-3)(x+1)=0
x-3=0或x+1=0
x=3 或x=-1
x^2-2根号3x-6=0
x^2-2根号3x+3-3-6=0
(x-根号3)^2=9
x-根号3=3或x-根号3=-3
x=3+根号3 或x=-3+根号3
x^2-2根号3x-6=0
x^2-2根号3x+3-3-6=0
(x-根号3)^2=9
x-根号3=3或x-根号3=-3
x=3+根号3 或x=-3+根号3
x^2-2根号3x-6=0
用公式法解得
x=(2根号3+根号12+4*1*6)/2=3+根号3
或x=(2根号3-根号12+4*1*6)/2=-3+根号3

收起

解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) (x^2+x)(x^2+x-3)-3(x^2+x)+8=0解方程解方程{3X+X+2X=12}3X+X+2X=12 解方程:2(X-3)(X+5)=X平方+(X+2)(X-2)+(X+7) 解方程(x-3/x)-(3-x/x+1)=5x-15/2x+2 解方程：(x-2)(x^2-6x-9)=x(x-5)(x-3) x/(x-2)+(x+1)/(x-6)=2x/(x-3) 解分式方程解方程 x(2x-4)+3x(x-1)=5x(x-3)+8 解方程 3x/x×x-1+x×x-1/3x=5/2 解方程x（x-1)(x-2)(x-3)(x-4)=24x=? 解方程：x(3x-4)+2x(x+7)=5x(x-7)+90 解方程:x-2x+3x-4x+...+99x-100x=25 解方程：x-2x+3x-4x+.+99x-100x=25 解方程X(X+1)-X(X-3)=2(X+1)(X-1)+20 解方程 X(X+1)x(X+2)x(X+3)=3024 解方程2x:3=x: 解方程 |x+2|=-3x 解方程 (x+2):x=3: