y=2x*2+4x-7/x*2+2x+3的值域
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y=2x*2+4x-7/x*2+2x+3的值域y=2x*2+4x-7/x*2+2x+3的值域y=2x*2+4x-7/x*2+2x+3的值域由分母可知x属于R,此题分子与分母最高次数均是2,可采用判别式
y=2x*2+4x-7/x*2+2x+3的值域
y=2x*2+4x-7/x*2+2x+3的值域
y=2x*2+4x-7/x*2+2x+3的值域
由分母可知x属于R,此题分子与分母最高次数均是2,可采用判别式法,即化函数解析式为关于x的二次方程,显然,所得方程有解,故判别式大于或等于0
若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
3^x+2x=y,x
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x
计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x
化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x
x(x-y)2-(y-x)3
求值域 1,y=(x+2)/(x*x+3x+6) 2,y=3x/(x*x+4)
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20