15-2x(x/100)=5,
2x+3x+4x+5x+x+6x+7x=100
1x+2x+3x+4x+5x+6x+7x…+99x=100
解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
先化简再求值(x+3x+5x+7x+.+101x)-(2x+4x+6x+...100x),其中x=51分之2
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
(X+X)+(X-X)+(X*X)+(X/X)=100
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+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
∫(x^4-4x^2+5x-15)/(x^2+1)(x-2) dx=?
5x+15/x^2+x-6=A/x-2+B/x-3
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)