(3/20)/(x/(100-x))=(2/5)/(2x/(100-2x))
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)
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
1+x+x^2+x^3+.+x^99+x^100
1X+2X+3X…+98X+99X+100X=50500X X等于多少?
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
x-2x+3x-4x+...+99x-100x=25
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
已知x^4+x^3+x^3+x^2+x^1+1=0,求x^100+x^99+x^98+x^97+x^96的值
1.2(x-2)-3(4x-1)=9(1-x) 2.11x+64-2x=100-9x 3.15-(8-5x)=7x+(4