2x+15-21=6
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
(x^21+x^15+x^12+x^9+x^6+x^3+1)/(x^2+x+1)
35(X-2)+15(5X-6)=(22X-51)+21(3X-4)
35(x-2)-15(5x-6)=(22x-63)-21(3x-4)咋算?
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
先化简,再求值:x(x^2-6x-9)-x(x^2-8x-15)+2x(3-x),其中x=3,
X(X的2次方-6X-9)-X(X的2次方-8X-15)+2X(3-X),其中X=1/3. 先化简,再求值
5x+15/x^2+x-6=A/x-2+B/x-3
解方程x-1/6x=5 x+3/4x=21 1/5x+2/5x=15
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
解方程:(x-2)(x-3)+2(x+6)(x-5)=3(x的平方-7x+15)
35(x-2)-15(5x-6)=22x-63-21(3x-4)