Rút gọn các biểu thức sau: a) 2^ căn 3 +1 : 2^ căn 3 -1

a) 23+1:23−1=23+1−(3−1)=22=4

b) 328=32.8=32.8=316=34=81

c) 728=72.8=72.8

=716=74=72=49

d) a25+1:a25−2=a25+1−25−2=a3

e) 33+2. 3−1+2. 91−2=33+2. 3−1+2. 321−2

=33+2.3−1+2.32.1−2=33+2+−1+2+2 .  1−2=34=81

g) a−3b1313=a−313. b1313

=a−3.13. b13.13=a−1. b13=b3a