a,(2 mũ 17 +15 mũ 3 ).(3 mũ 45 -6 mũ 5 ).(2 mũ 4 -4 mũ 2 ) b,|-3|+|24|:4 +5 mũ 3 :125 40+(139+172+99)-(139+199-172 ) làm giúp mình với

`a)(2^17+15^3).(3^45-6^5).(2^4-4^2)`

`=(2^17+15^3).(3^45-6^5).0`

`=0`

`b)|-3|+|24|:4 +5^(3):125`

`=3+24:4+125:125`

`=3+6+1`

`=10`

`c)40+(139+172+99)-(139+199-172 )`

`=40+139+172+99-139-199+172`

`=40+(172+172)+(99-139-199)`

`=40+344-239`

`=384-239`

`=145`