Rút gọn biểu thức: P= x căn x -1/x - căn x -x căn x +1/ x+ căn x +x+1/ căn x
Giải thích
Ta có:
P=xx−1x−x−xx+1x+x+x+1x
P=x−1x+x+1xx−1−x+1x−x+1xx+1+x+1x
P=x+x+1x−x−x+1x+x+1x
P=x+x+1−x+x−1+x+1x
P=x+2x+1x.
Ta có:
P=xx−1x−x−xx+1x+x+x+1x
P=x−1x+x+1xx−1−x+1x−x+1xx+1+x+1x
P=x+x+1x−x−x+1x+x+1x
P=x+x+1−x+x−1+x+1x
P=x+2x+1x.