Giải thích các bước giải:
c)4x-5/x-1 = 2 + x/x-1
<=>4x-5/x-1 = 2(x-1)+x/x-1
<=>4x-5 = 2(x-1)+x
<=>4x-5=2x-2+x
<=>4x-3x=-2+5
<=>x=3
d)7/x+2 = 3/x-5
<=>7(x-5)/(x+2)(x-5) = 3(x+2)/(x+2)(x-5)
<=>7(x-5) = 3(x-2)
<=>7x-35 = 3x-6
<=>7x-3x = -6+35
<=>4x = 41
=>x=41/4
e)2x+5/2x - x/x+5 = 0
<=>(2x+5)(x+5)-2x^2/2x(x+5) = 0
<=>(2x+5)(x+5)-2x^2 = 0
<=>2x^2+15x+25-2x^2 = 0
<=>15x=-25
=>x=-5/3
f)12x+1/11x-4 + 10x-4/9 = 20x+17/18
<=>(12x+1).18+(10x-4)(11x-4).2/18(11x-4) = (20x+17)(11x-4)/18(11x-4)
<=>(12x+1).18+(10x-4)(11x-4).2 = (20x+17)(11x-4)
<=>216x+18+(110x^2-84x+16).2 = 220x^2+107x-68
<=>216x+18+220x^2-168c+32 = 220x^2+107x-68
<=>48x-107x = -68-50
<=>-59x = -118
=>x=2
HỌC TỐT NHA BẠN^^
