Thực hiện các phép tính sau: b) x/ x^2+1- ( 3/ x+6+x-2/ x+4) .
Giải thích
b, xx2+1−3x+6+x−2x+4+3x+6−1x2+1−x−2x+4
=xx2+1−3x+6−x−2x+4+3x+6−1x2+1+x−2x+4
=xx2+1−1x2+1+3x+6−3x+6+x−2x+4−x−2x+4
=x−1x2+1+0+0=x−1x2+1
b, xx2+1−3x+6+x−2x+4+3x+6−1x2+1−x−2x+4
=xx2+1−3x+6−x−2x+4+3x+6−1x2+1+x−2x+4
=xx2+1−1x2+1+3x+6−3x+6+x−2x+4−x−2x+4
=x−1x2+1+0+0=x−1x2+1