`a ) ( 3/4 + 1/6 ) × 2/3`
`= ( 9/12 + 2/12 ) × 2/3`
` = 11/12 × 2/3`
`= 22/36 = 11/18`
`b ) ( 3/4 + 1/6 ) × 2/3`
`= 3/4 × 2/3 + 1/6 × 2/3`
`= 1/2 + 1/9`
`= 9/18 + 2/18`
`= 11/18`
`c ) ( 5/9 - 1/2 ) × 3/4`
`= ( 10/18 - 9/18 ) × 3/4`
`= 1/18 × 3/4`
`= 3/72 = 1/24`
`d ) ( 5/9 - 1/2 ) × 3/4`
`= 5/9 × 3/4 - 1/2 × 3/4`
`= 5/12 - 3/8`
`= 10/24 - 9/24`
`= 1/24`
`#dtkc`