a) 2 mũ 10 -2 mũ 5
= 1024-32
=992
b) 5 mũ 2+ 12 mũ 2
=25+144
=169
c)2 mũ 9. 3 +2 mũ 9. 5 - 2 mũ 12
=2 mũ 9. (3+5)- 2 mũ 12
= 2 mũ 9 .2 mũ 3 -2 mũ 12
=4096-4096
=0
d)343: 7 mũ 2 -2 mũ 4 : 2 mũ 2
=343: 49-16: 4
=( 343: 49)-(16:4)
=7-4
=3
e) 3 mũ 8 : 3 mũ 4 - 2 mũ 3 ×2 mũ 2
=6561: 81- 8×4
=(6561: 81)- (8×4)
=81-32
=49
f)1256-256: 2 mũ 3+ 15 mũ 2 : 3 mũ 2
= 1256-256: 8+225:9
=1256-256:(225+9-8)
=1256-256: 256
= 1256-(256:256)
=1256-1
=1255
