Giúp em bài 3 với ạaa tks

`a)`

`3^3 . 3^12 = 3^(3+12) = 3^15`

`b)`

`7.7^5 . 7^2 = 7^(1+5+2) = 7^8`

`c)`

`a^7 . a^3 . a^2 = a^(7+3+2) = a^12`

`d)`

`5^3 . 5^6 . 5^5 = 5^(3+6+5) = 5^14`

`a')`

`x^5 . x^6 . x = x^(5+6+1) = x^12`

`b')`

`5^4 . 5 . 5^6 = 5^(4+1+6) = 5^11`

`c')`

`2^10 . 2^20 . 2^30 = 2^(10+20+30) = x^60`

`d)`

`10^2 . 10^3 . 10^3 = 10^(2+3+3) = 10^8`

`1)`

`x^6 : x^2 = x^(6-2) = x^4`

`->` Sai

`2)` 

`x^5 . x^2 = x^(5+2) = x^7`

`->` Sai

`3)` 

`5^4 : 5 = 5^(4-1) = 5^3`

`->` đúng

`4)`

`41^5 : 41^5 = 41^(5-5) = 41^0 = 1`

`-> đúng

`5)`

`7^10 : 7^2 = 7^(10-2) =7^8`

`->` sai

`6)`

`5^4 : 5 = 5^(4-1) = 5^3`

`->` sai

`@Tobi`

Đáp án`+`Giải thích các bước giải:

`3`.

`a, 3^3``.3^12`

`= 3^{3+12}`

`= 3^{15}`

`b, 7.7^5``.7^2`

`= 7^{1+5+2}`

`= 7^8`

`c, a^7``.a^3``.a^2`

`= a^{7+3+2}`

`= a^12`

`d, 5^3``.5^6``.5^5`

`= 5^{3+6+5}`

`= 5^14`

`____________________`

`a, x^5``.x^6``.x`

`= x^{5+6+1}`

`= x^{12}`

`b, 5^4``.5.``5^6`

`= 5^{4+1+6}`

`= 5^{11}`

`c, 2^10``.2^20.``2^30`

`= 2^{10+20+30}`

`= 2^{60}`

`d, 10^2``.10^3``.10^3`

`= 10^{2+3+3}`

`= 10^{8}`

`_______________________`

`4`. Xét tính đúng sai.

`1. x^6``:x^2= x^{6-2}=x^{4}`

`->` Sai.

`2. x^{5}.``x^{2}=x^{5+2}=x^{7}`

`->` Sai.

`3. 5^{4}:5=5^{4-1}=5^{3}`

`->` Đúng.

`4. 41^{5}:41^{5}=41^{5-5}=41^0=1`

`->` Đúng.

`5. 7^{10}:7^2=7^{10-2}=7^8`

`->` Sai.

`6. 5^{4}:5=5^{4-1}=5^{3}`

`->` Sai.