10.9*x=14*(4/5)*x-150
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+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
2x+3x+4x+5x+x+6x+7x=100
4x+5x+14=42-2(x+3)
x-2/5x+14=1/4x,
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?
提取公因式:已知x*x-5x+1=0 求x*x*x-4x*x-4x-1
x(x-14)二0*x平方十|2x十27=0,x平方=x+56,x(5x+4)=5x+4,4x平方-45=3|x,-3x
x-y+5x-4x= ?
x-1=3x+3 x-3=12-4x 6x-14=5x-10 x+1=2-4x
解方程3x-10/x-3 +4x-5/x-1=6x-17/2x-5 +8x-14/2x-3