0.6x=0.5x+5=0.4x+20
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)+(X-X)+(X*X)+(X/X)=100
0.5x+(5x+20)*0.5=298 x
0.2x+0.4x=12 x=?20x+x=420 x=?
4x-3x(20-x)=5x-7x(20-x)
4x-3x(20-x)=5x-7x(20-x)的解法
5*(x-2)=4*(x+3) 2x+(50-x)*4=140 3x-(8-x)=20*4 200x=(x-0.5)*2
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
(x-22)+(x-24)+(x-27)+(x-20)=x
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
1、0.3X-0.4X=0.5 2、5X-2.5X+3.5X=-18 3、X-2/5X=-3+6
4X减0.5X等于1.75 X除0.63=12 5X加X=20 5X减3X=3.2