25^5 . 2^10/20^4.5^4 25/14 : x + 15 = 0 Giúp em khó quá 20/09/2021 Bởi Alaia 25^5 . 2^10/20^4.5^4 25/14 : x + 15 = 0 Giúp em khó quá
Đáp án: `a,(25^5 . 2^(10))/(20^4 . 5^4)` `=((5^2)^5 . 2^(10))/(20^4 . 5^4)` `=(5^(10) . 2^(10))/(20^4 . 5^4)` `=((5.2)^(10))/((20.5)^4)` `=(10^(10))/((10^2)^4)` `=(10^(10))/(10^8)` `=10^2=100` `b,25/14:x+15=0` `\to25/14:x=-15` `\tox=25/14:(-15)` `\tox=-5/42` Vậy `x=-5/42` Bình luận
`(25^5 . (2^10))/(20^4.(5^4))` `= (5^10.(2^10))/(2^8 . (5^4 ). (5^4))` `= (5^10.2^10)/(2^8.5^8)` `= 5^2 . 2^2` `= 25 . 4` `= 100` `25/14 : x + 15 = 0` `⇒ 25/14 : x = 0 – 15` `⇒ 25/14 : x = -15` `⇒ x.25/14 : x = x(-15)` `⇒ 25/14 = x(-15)` `⇒ 25/14 = -15x` `⇒ x = 25/14 : -15` `⇒ x = – 25/42` Bình luận
Đáp án:
`a,(25^5 . 2^(10))/(20^4 . 5^4)`
`=((5^2)^5 . 2^(10))/(20^4 . 5^4)`
`=(5^(10) . 2^(10))/(20^4 . 5^4)`
`=((5.2)^(10))/((20.5)^4)`
`=(10^(10))/((10^2)^4)`
`=(10^(10))/(10^8)`
`=10^2=100`
`b,25/14:x+15=0`
`\to25/14:x=-15`
`\tox=25/14:(-15)`
`\tox=-5/42`
Vậy `x=-5/42`
`(25^5 . (2^10))/(20^4.(5^4))`
`= (5^10.(2^10))/(2^8 . (5^4 ). (5^4))`
`= (5^10.2^10)/(2^8.5^8)`
`= 5^2 . 2^2`
`= 25 . 4`
`= 100`
`25/14 : x + 15 = 0`
`⇒ 25/14 : x = 0 – 15`
`⇒ 25/14 : x = -15`
`⇒ x.25/14 : x = x(-15)`
`⇒ 25/14 = x(-15)`
`⇒ 25/14 = -15x`
`⇒ x = 25/14 : -15`
`⇒ x = – 25/42`