16+0.2x=0.25x十9求x!

16+0.2x=0.25x十9求x! 8×十9x十10x十16x 已知1十x十x^2 十x^3=0,求x十x^2十x^3十x^4+x^5十x^6+x^7十x^8的值 7十x:9十x=2:3求x要具体过程 3x十9x十X=26. x十1分之1-x=t求x x十1/3[x十1/3(x-9)]=1/9(x-9)-1解方程; 1/9{1/7[1/5((x十1/3[x十1/3(x-9)]=1/9(x-9)-1解方程; 1/9{1/7[1/5((x十2)/3十4)十6]十8}=1求x! 13.2x十9x=33.3 1已知x²+x-1=0,求2x³十3x²-x 2已知x²-2x一3=0,求x³十x²-9x一8的值 427十7x二387十9x=? X十1/4X=9/16怎么解 x十24十x=34 X.(X十1)x(X十2)x(x十3) =360 x乘(x十2)=x一1乘(x除2x3十40)求x= x+1/x=3,求（x^4十x^2十1）分之（x^2） 已知f(1一x/1十x)=1一x^2/1十x^2,求f(x) 1/(x^2一4x十3)十1/(x^2一8x十15)十1/(x^2-12x十35)十1/(x^2一16x十63)= x十y=10,2X十y=12,求x、y