giúp em với ạ:3 camonw

`a.2^3-5^3:5^2+12.2^2`

`=8-5+12.4`

`=8-5+48`

`=3+48`

`=51`

`b.5[(85-35:7):8+90]-50`

`=5[(85-5):8+90]-50`

`=5[(80:8+90]-50`

`=5[10+90]-50`

`=5.100-50`

`=500-50`

`=450`

`c.2[(7-3^3:3^2):2^2+99]-100`

`=2[(7-3):4+99]-100`

`=2[4:4+99]-100`

`=2[1+99]-100`

`=2.100-100`

`=200-100`

`=100`

`d.2^7:2^2+5^4:5^3.2^4-3.5^2`

`=2^5+5^1.16-3.25`

`=32+5.16-3.25`

`=32+80-75`

`=112-75`

`=37`

`e.2[(95+5^2:5):2^2+180]-2^2.10^2`

`=2[(95+5):4+180]-4.100`

`=2[100:4+180]-4.100`

`=2[25+180]-4.100`

`=2.205-400`

`=410-400`

`=10`

`f.3^4.2+2^3.5-7(5^7:5^5)`

`=81.2+8.5-7.5^2`

`=162+40-7.25`

`=162+40-175`

`=202-175`

`=27`

`g.ghi lại đề` 

`h.5.3^5:(3^8:3^5).5^6`

`=5.243:3^3.15625`

`=1215:27.15625`

`=45.15625`

`=703125`

`i.4[(3+3^7:3^4):10+97]-300`

`=4[(3+3^3):10+97]-300`

`=4[(3+27):10+97]-300`

`=4[30:10+97]-300`

`=4[3+97]-300`

`=4.100-300`

`=400-300`

`=100`

`k.5[(92+2^5:2^2):5^2+2^4]-7^2`

`=5[(92+2^3):25+16]49`

`=5[(92+8):25+16]49`

`=5[100:25+16]49`

`=5[4+16]49`

`=5.20.49`

`=100.49`

`=4900`

`n.(5^2021-5^2020):5^2020`

`=5^2021-5^2020:5^2020`

`=5^2021-(5^2020:5^2020)`

`=5^2021-5^0`

`=5^2021-1`

`m.(6^2007-6^2006):6`

`=6^2007-6^2006:6`

`=6^2007-6^2005`

`o.(7^2025+7^2024):7^2024`

`=7^2025+7^2024:7^2024`

`=7^2025+7^0`

`=7^2025+1

` bài 2:`

`a.ghi lại đề `

`b.5.5^n=25`

`5^n=25:5`

`5^n=5`

`5^n=5^1`

` vậy n=1`