x^5十3x=?和2x^3-4x+6=?

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 x^5十3x=?和2x^3-4x+6=? X.(X十1)x(X十2)x(x十3) =360 1/x^2一6x十8=1/x^2一4x十3x^2一6x十8和x^2一4x十3 4(X十3)=6x 3十x十x=5x, 5x十2x=42 15十2x一3=48 2x十3x十17=37 6x一3x=6÷5 9x一2x=15x十2x=4215十2x一3=482x十3x十17=376x一3x=6÷59x一2x=1.4十0.077(2x一6)=15.4 2x十5=17,8x-3x=6.5,6x十3x=36, 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! 若A=(3x^2)十5x 2 B=(4x^2)十5x十2 a和b的大小 4x十6y=48 3x十5y=38求x和y 一(x2十3X)十2(4X十x2),其中X=一2 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)= 3x十7x十5x一7x=17十18 2x²—5x十x²+4一3x²=? (x十2）（x+3）（x-4）（x-5）=120 2x十8十3x十8十4x十8=?请算出这道题目求士寸佰了⑥ 如果4分x十6等于5,那么2x十3=