4x-3(x-2)=3x+6怎么做

x-1/x-2-x-3/x-4=x-2/x-3-x-4/x-5怎么做? x+6+2x-3-4x怎么做 4x-14=(x+2)*(x-3)怎么做 (x-4)(x-3)-(x-2)(x-3)怎么做 (x-1)(x+2)(x+3)(x+6)怎么做? x*x^3+(-2x^2)^2+14x^6/(-4x^2)怎么做? x*x^3+(-2x^2)^2+14x^6/(-4x^2)怎么做? (x^2+1)-3x(x-1)+2(x^2+x-1),其中x=102/5怎么做?另外还有一道解方程的：5(x^2+x-3)-4x(6+x)+x(4-x)=0, (3x+2)(X+3)=x+14怎么做 4x^2-x^3-4x怎么做 X(X-4)=3X+1怎么做 (2x 3)*x等于5x-4怎么做 x+2x/3+x-80=720怎么做 3[x-2(x-1)]=9x怎么做 2(x-2)-3(3x+2)=x+6怎么做 X=几? 4X-3(20-X)=6X-7(11-X)简便算法怎么做 (3/x+2)+1/x=4/x²+2x这道题怎么做 1/（x+2)+1/(x+3)=1/(x+1)+1/(x+4)怎么做