3x+(2/5)*15=12
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
(5X-15)-(2X+3)=X+12
已知x -2x=5,求代数式x四次方+3x³-12x² -31x-15
x=4x=254 5x-x=180 3x+x=16 4x-2x=28 15x-11x=12.8 (12+12*1.5)x
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
请问这张图什么意思?x^5+3x^4+12x^3+6x^2+3x+15=0
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+15/x^2+x-6=A/x-2+B/x-3
5x+9x=6x*2+12 x+9-x/3=4
x^3×x^5×x+(x^3)^12+4(x^6)^2=?
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
2x-10=15x+30,6x-6=6x+2,9-3x=2x-8,5x=9x-50 ,5y-5=12-6y,15x-9=