Mọi người giúp mình vs ạ Question Mọi người giúp mình vs ạ in progress 0 Môn Toán Khánh Gia 5 years 2020-11-19T23:54:59+00:00 2020-11-19T23:54:59+00:00 1 Answers 73 views 0
Answers ( )
Đáp án:
`a)`
` x + 65 = 108`
` x =108 -65`
` x =43`
`b)`
` 5(4+x) = 60`
` 4 +x = 12`
` x = 12-4 = 8`
`c)`
` 12(18-x) = 84`
` 18 – x = 7`
` x= 18-7`
` x= 11`
`d)`
` (39-x) : 6 = 3`
` 36- x= 18`
` x= 36-18`
` x= 18`
`e)`
`28+ (55-2x) = 7^2`
` 28 + 55 -2x = 49`
` 83 -2x = 49`
` 2x = 34`
` x = 17`
`f)`
` (x-1)^2 = 16 = (4)^2 = (-4)^2`
TH1
` x-1= 4`
` x = 5`
TH2
` x -1 = -4`
` x = -3`
`g)`
` 3^4 . 3^x = 3^10`
` 3^x = 3^10 : 3^4`
` 3^x = 3^6`
` x =6`
`h)`
` 2. 4^x = 2^6. 32`
` 2. 2^(2x) = 2^6. 2^5`
` 2^(2x+1)= 2^11`
` 2x +1 = 11`
` 2x = 10`
` x= 5`
`i)`
` (2x-5): 3 = 3^2`
` 2x – 5 = 3^3 = 27`
` 2x = 27 +5 = 32`
` x =16`
`j)`
` 38 – (24 + 20:x) = 10`
` 24 +20 😡 = 28`
`20 : x =4`
` x =5`