a: =>x:375=424
hay x=159000
b: =>x=178x35+4=6234
c: =>7500:x=25
hay x=300
`a) x : 375 - 24 = 400`
` x : 375 = 400 + 24`
`x : 375 = 424`
` x = 424 xx 375`
`x = 159000`
`b) x : 178 = 35 (dư 4)`
` x = 178 xx 35 + 4`
`x = 5234`
`c) 4500 - 7500 : x = 4475`
`7500 : x = 4500 - 4475`
`7500 : x = 25`
` x = 7500 : 25`
`x = 300`
`d) 4999 : x = 49 (dư1)`
`x = (4999 - 1 ): 49=102`
