`x/5 = 161/115`
`=> 115x = 161 × 5`
`=> 115x = 805`
`=> x = 805 : 115`
`=> x = 7`
---------------------------
`360 : 5 + 4,8 = 8 × (x : 7 + 4,9)`
`=> 72+ 4,8 = 8 × (x : 7 + 4,9)`
`=> 76,8 = 8 × (x : 7 + 4,9)`
`=> x : 7 + 4,9 = 76,8 : 8`
`=> x : 7 + 4,9 = 9,6`
`=> x : 7 = 9,6 - 4,9 `
`=> x : 7 = 4,7`
`=> x = 4,7 × 7`
`=> x = 32,9`
(Chúc bạn học tốt)
`a) x/5 = 161/115`
`=> x/5 = 7/5`
`=> x = 7/5 . 5`
Vậy `x=7`
`b) 360 : 5 + 4,8 = 8 . (x:7 + 4,9)`
`=> 72 + 4,8 = 8 . (x : 7 + 4,9)`
`=> 8 . (x : 7 + 4,9 ) = 76,8`
`=> x : 7 + 4, 9 = 76,8 : 8`
`=> x : 7 = 9,6 - 4,9`
`=> x = 4,7 . 7`
Vậy `x = 32,9`
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