y=(3x+1)/(x-2)y-5/(2x^2-4x+3)y=(2x^2-x+2)/(x^2+x+1)请问这种类型的求值域怎么求?一定要有过程
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y=(3x+1)/(x-2)y-5/(2x^2-4x+3)y=(2x^2-x+2)/(x^2+x+1)请问这种类型的求值域怎么求?一定要有过程
y=(3x+1)/(x-2)
y-5/(2x^2-4x+3)
y=(2x^2-x+2)/(x^2+x+1)
请问这种类型的求值域怎么求?一定要有过程
y=(3x+1)/(x-2)y-5/(2x^2-4x+3)y=(2x^2-x+2)/(x^2+x+1)请问这种类型的求值域怎么求?一定要有过程
1.分离法
y=(3x+1)/(x-2),定义域为{x|x≠2}
y=(3x+1)/(x-2)=7/(x-2)+3
当x≠2时,7/(x-2)≠0,y≠3
∴函数值域为{y|y∈R且y≠3};
2.利用函数的单调性,数形结合
y=5/(2x²-4x+3),定义域为R,
y=5/(2x²-4x+3)=5/[2(x-1)²+1],
∵x∈R,
∴2(x-1)²+1≥1;
0
y=(3x+1)/(x-2)
=[3(x-2)+7]/(x-2)
=3+7/(x-2)
y≠3
y=5/(2x^2-4x+3)
=5/[2(x-1)^2+1]
2(x-1)^2+1>=1
0
x^2+x+1=(x+1/4)^2+3/4>0所以定义域为R
化为关于x的一元二次方程
(y-2)x^2+(y+1)x+y-2=0
△=(y+1)^2-4(y-2)^2>=0
解得1<=y<=5
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1