X+[(X+12)*4/5]=42
x-x/5=2.4 (求未知数x) 12÷5%x=8 4x+x=12.5
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
3/x-1=4/x 6/x+1=x+5/x(x+1)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
X+12分之5X=(X-3)+5分之4(X-3)
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
六年级的方程,只有五道 x-128×3=0.06-2x x(2+x)=4x(12+3x) 7x+5
(先化简后求值)(3x/x+2-x/x-2)+2x/x^2-4,x=4-根号5,
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
解方程.(5x/x²+x-6)+(2x-5/x²-x-12)=7x-10/x²-6x+8
5x/(x+3)(x+2)+(2x-5)/(x-4)(x+3)=(7x-70)/(x+2)(x+4)
6/(x+1)=(x+5)/[x(x+1)] (3-x)/(x-4)+1/(4-x)=1 2/(1+x)-3/(1-x)