1.2*(21+9*X)=18+(12*X)

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) (12x-10)/21+(7x-9)/20=(2-x)/15+(8x-9)/12 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 问18x+37=51.4 x=?9x-7x=50 x=?5x+6x=16.94 x=?12x/4=24 x=? X(x+3)分之一+(X+3)(X+6)分之一+(X+6)(X+9)分之一=2x+18分之三 1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=3/2x+18 x+x+3=9 12x(是乘）（x+6)=144 3x（是乘）(x-3)=18 4x(乘）2+2x（是乘）(x-3)=4 3X-18=13.2 1.5X-X=6 4X+1.2X=26 5x+9x=6x*2+12 x+9-x/3=4 (x-3)(x-2)+18=(x+9)(x+1),X是多少啊? x/(x+3)-x/(3-x)=18/(x平方-9)