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a) = 2^12 . 2^2 . 2^40
= 212+2+40
= 2^54
b)= 3^5 . 3^3 . 3^8
= 35+3+8
= 3^16
c)= 5^4 . 5^2 . 5^3
= 54 + 2 +3
= 5^9
a) 84. 22.1610 = (23)4.22.(24 )10= 212 .22.240=254
b) 35.27.812 = 35.33.( 34) 2 = 35 . 33.38 = 316
c) 252.52.125 =(52)2 .52.53= 54.52.53= 59
Trung Thu vui vẻ nha 
thuy hang
42.83 = (22)2.(23)3 = 24.29 = 213
93.272 = (32)3.(33)2 = 36.36 = 312
82.253 = (23)2.(52)3 = 26.56 = (2.5)6 = 106
1: 8=2^3
2: 25=5^2
3: 4=2^2
4: 49=7^2
5: 81=9^2
6: 36=6^2
7: 100=10^2
8: 121=11^2
9: 144=12^2
10: 169=13^2
11: 27=3^3
12: 125=5^3
13: 1000=10^3
14: 32=2^5
15: 243=3^5
16: 343=7^3
17: 216=6^3
18: 64=4^3
19: 225=15^2
20: 128=2^7
Giải
a) (−8).(−3)3.(+125)(−8).(−3)3.(+125)
= [(−2).(−2).(−2)].[(−3).(−3).(−3)].(5.5.5)[(−2).(−2).(−2)].[(−3).(−3).(−3)].(5.5.5)
= [(−2).(−3).5].[(−2).(−3).5].[(−2).(−3).5][(−2).(−3).5].[(−2).(−3).5].[(−2).(−3).5]
= 30.30.30=30330.30.30=303
b) 27.(−2)3.(−7).(+49)27.(−2)3.(−7).(+49)
= (3.3.3).[(−2).(−2).(−2)].[(−7).(−7).(−7)](3.3.3).[(−2).(−2).(−2)].[(−7).(−7).(−7)]
= [3.(−2).(−7)].[3.(−2).(−7)].[3.(−2).(−7)][3.(−2).(−7)].[3.(−2).(−7)].[3.(−2).(−7)]
= 42.42.42=423
a: \(=5^5\cdot32=10^5\)
b: \(=5^3\cdot\left(-2\right)^3\cdot\left(-3\right)^3\cdot1=30^3\)
c: \(=\left(-8\right)^5\cdot9^5=-72^5\)