`a, 6.\frac{-5}{6 ` `=` `\frac{-30}{6} = -5`
`b, 2/3+3/4. 16/-9`
`= 2/3+3/4. \frac{-16}{9} `
`= 2/3 + \frac{-12}{9}`
`= 6/9 + \frac{-12}{9} = -2/3 `
` c, 1/3-1/4. 8/3 = 1/3 - 2/3 = -1/3`
`d, (3/2-5/4).(3/11+14/22)`
`= (6/4-5/4).(6/22+14/22)`
`= 1/4 . 10/11 = 10/44 = 5/22`