解方程:2^2x+1-9*2^x+4=0

解方程(3x^2+9x+7)/(x+1)-(2x^2+4x-3)/(x-1)-(x^3+x+1)/(x^2-1)=0 解方程：2/x^2+x+3/x^2-x-4/x^2-1=0 解方程4x^2+2x√(3x^+x)+x-9=0 解方程：(4/x-2)+(x-1/x-5x+6)+(2/3-x)=0 解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1 解方程 x(2x-4)+3x(x-1)=5x(x-3)+8 解方程(x²-x+4)x-(x-1)(x²+2)=x+7 解方程：2x(x-9x)+16=0 解方程：x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6) 解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8) 解方程】(x+8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3) 解方程：（x-8）/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)