4(3x + 120) - 25 = 12 x + 630
解方程 x+4/11x=75 x-1/4x=120 3x+12x=180 8x-x=175
x-2x+3x-4x+...+99x-100x=25
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
12—120%X=6 5分之3X—5%X=5.5 (1+25%)X=7.5 X—30%X=91 4%X+6%X=29.4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
4X²-3X=0 4X²-25=0 9X²+12X+4=0 15X²+6=X+8
4(x-3)^2=25,(x-1)(x+3)=12,(x^2+x)(x^2+x-2)=24
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
若x=π/3,|x+1|+|x+3|+...+|x+13|-|x+2|-|x+4|-...-|x+12|
0.3(x+4)=120 (x-25)÷6=7 8(x-12)=144 (x+9)÷3=13 12x-12=0 0.5(
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少