Question

[Thủy Phạm Thanh]

Giải phương trình 

\(\frac{1}{x^2+5x+6}+\frac{1}{x^2+7x+12}+\frac{1}{x^2+9x+20}=\frac{1}{6}\)

Answer 1

[Nguyễn Anh Quân]

Đk x khác -2;-3;-4;-5

pt <=> 1/(x+2).(x+3) + 1/(x+3).(x+4) + 1/(x+4).(x+5) = 1/6

<=> 1/x+2 - 1/x+3 + 1/x+3 - 1/x+4 + 1/x+4 - 1/x+5 = 1/6

<=> 1/x+2 - 1/x+5 = 1/6

<=> x+5-x-2/(x+2).(x+5) = 1/6

<=> 3/(x+2).(x+5) = 1/6

<=> (x+2).(x+5) = 3 : 1/6 = 18

<=> x^2+7x+10 = 18

<=> x^2+7x-8=0

<=> (x-1).(x+8) = 0

<=> x1=0 hoặc x+8=0

<=> x=1 hoặc x=-8

k mk nha