(4x+20)/4=-2+(6x-20)/5x
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
5*(x-2)=4*(x+3) 2x+(50-x)*4=140 3x-(8-x)=20*4 200x=(x-0.5)*2
已知x-4/x=6,求代数式2x²-20x/x²-14x+4除(1-x-12/2-x)的值
4(x+3)=2x+2 7(x-1)=2x+3 4x+20=6x-30 4x-12=2x 2x-3=x+7 3x-4=2
6/(x+1)=(x+5)/[x(x+1)] (3-x)/(x-4)+1/(4-x)=1 2/(1+x)-3/(1-x)
计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1
5x-3(2x+1)=6x-4(5-3x)求x
3/x-1=4/x 6/x+1=x+5/x(x+1)
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
2x+3x+4x+5x+x+6x+7x=100
X-(X/2)+(X/3)-(X/4)+(X/5)-(X/6)=1
x-(1/5+1/5)x-39=39 x-1/4x-2/5x=112 x-1/6x-1/3x-12=20