Thực hiện các phép tính sau: b) 1/x+5-1/x-5+2x/x^2-25 ;
Giải thích
b, 1x+5−1x−5+2xx2−25
=1x+5−1x−5+2xx+5x−5
=x−5x+5x−5−x+5x+5x−5+2xx+5x−5
=x−5−x+5+2xx+5x−5
=x−5−x−5+2xx+5x−5
=2x−10x+5x−5
=2x−5x+5x−5=2x+5
b, 1x+5−1x−5+2xx2−25
=1x+5−1x−5+2xx+5x−5
=x−5x+5x−5−x+5x+5x−5+2xx+5x−5
=x−5−x+5+2xx+5x−5
=x−5−x−5+2xx+5x−5
=2x−10x+5x−5
=2x−5x+5x−5=2x+5