1.7/9X(18+9/7)2.7/9X(15+12)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少
(x^21+x^15+x^12+x^9+x^6+x^3+1)/(x^2+x+1)
在有理数域上分解因式x^18+x^15+x^12+x^9+x^6+x^3+1
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
(12x-10)/21+(7x-9)/20=(2-x)/15+(8x-9)/12
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
X 7 X - X 7 X = X 9 8 X 9 X - X 9 X = 4 9
问18x+37=51.4 x=?9x-7x=50 x=?5x+6x=16.94 x=?12x/4=24 x=?
x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1
化简:9x-12x+5x,3x-5x-2+5x+8,3x+5+2x+3-7-11x
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?