f, 4/x+6 + 1/x-3=9/x^2+3x-18
g, 2/x+6 + 1/x+1=3x+8/x^2+7x+6
h, 3/2x-1 + 1/x+4=5x+11/2x^2+7x-4
i,2/x^2+3x+2 + 1/x^2+5x+6=1/x^2-3x+2
k,3/x^2+x-2 + 2/x^2-4=1/x^2-3x+2
Loga
Sinh Học lớp 12
