50:14=2x:70 = =
2x+(14-x)=x+14
(x^3)^()*x^2=x^14
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
(X+X)+(X-X)+(X*X)+(X/X)=100
已知x*x-5x=14,求(x-1)(2x-1)-(x+1)*(x+1)+1的值
x/x平方-x+2=2x/x+1
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
5x+2=-8 x=30 3x=5x-14 x
20+0.8x=x-14 112-4x=2x(80-4x)
解方程 x(x+1)(x²-2x-4)=0 x³-2x+1=0 x的4次方+8x³+14x
5x/(x+3)(x+2)+2x-5/(x-4)(x+3)=7x-70/(x+2)(x+4)