5X-20=(4X+20)/2
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-(1/5+1/5)x-39=39 x-1/4x-2/5x=112 x-1/6x-1/3x-12=20
x+3/20x=46 ,x-1/5x=40 ,x-1/2x=3/4 ,x-0.2x=18解方程
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
2x^2+5x+6=0 X^2+x-20=0 (x-2)(4+x)=6 3x^2-48=0
4x-2=3-x -7x+2=2x-4 -x=-0.4x+1 11x+1=5(2x+1) 4x-3(20-x)=3 5(
-6x+3=2x+11 x=3/2x+14 3/4x-6=3/2x+3 20-3x=7x+4 5/9x+2=1/3x+4
2x+3x+4x+5x+x+6x+7x=100
5x+1=20x-(7x-3)和2x-5/6+3-x/4=1