(7x - 30):(3x + 30) = 3:2
计算:(x+1)x=7 (x-1)(x+2)=30 (3-x)(3-x)+x=9
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
4(x+3)=2x+2 7(x-1)=2x+3 4x+20=6x-30 4x-12=2x 2x-3=x+7 3x-4=2
2x+3x+4x+5x+x+6x+7x=100
5x+2=-8 x=30 3x=5x-14 x
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
x+x÷3+2x-30=180
2x+{3X(12.5-x)}=30
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^+x^6+x^7+x^8的值
求x^2-3x/x^2-6x+9*x^2-11x+30/x^2-5x-1