..帮帮忙··解解这几道数学题1.已知函数f(x)=log2 √2/9x+1则f(x)="?2.已知a.b为常数若f(x)=x^2+4x+3 f(ax+b)=x^2+10x+25则5a-b=?3.已知函数f(x)=log2 (x^2+1)/(ax^2+4x+b)的定义域为R,值域为[0.3]求a.b的值4.已知函数y=x
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..帮帮忙··解解这几道数学题1.已知函数f(x)=log2 √2/9x+1则f(x)="?2.已知a.b为常数若f(x)=x^2+4x+3 f(ax+b)=x^2+10x+25则5a-b=?3.已知函数f(x)=log2 (x^2+1)/(ax^2+4x+b)的定义域为R,值域为[0.3]求a.b的值4.已知函数y=x
..帮帮忙··解解这几道数学题
1.已知函数f(x)=log2 √2/9x+1则f(x)="?
2.已知a.b为常数若f(x)=x^2+4x+3 f(ax+b)=x^2+10x+25则5a-b=?
3.已知函数f(x)=log2 (x^2+1)/(ax^2+4x+b)的定义域为R,值域为[0.3]求a.b的值
4.已知函数y=x^2-4x x属于[-2.4]求值域
..帮帮忙··解解这几道数学题1.已知函数f(x)=log2 √2/9x+1则f(x)="?2.已知a.b为常数若f(x)=x^2+4x+3 f(ax+b)=x^2+10x+25则5a-b=?3.已知函数f(x)=log2 (x^2+1)/(ax^2+4x+b)的定义域为R,值域为[0.3]求a.b的值4.已知函数y=x
1、
f(x)=log2 √2/9x+1
=1/2-log2 9x+1
=3/2-log2 9x
2、
a=1
x^2+10x+25
=x^2+6x+4x+25
此题无解
3、
f(x)=log2 (x^2+1)/(ax^2+4x+b)的定义域为R
即ax^2+4x+b>0恒成立
a>0,△4
值域为[0.3],所以
g(x)=(x^2+1)/(ax^2+4x+b) 的值域【1,8】
x^2+1=(ax^2+4x+b)y (把x看成自变量)
(ay-1)x^2+4yx+by-1=0