`\text{c)}`
`( 3 1/4 - 6 5/9 ) × 2 2/17`
`= ( 13/4 - 59/9 ) × 36/17`
`= -119/36 × 36/17`
`= -7`
`\text{d)}`
`(-4/7 +1/3) : 9/5 + (2/3 - 3/7) : 9/5`
`= 5/9(-4/7+1/3) + 5/9(2/3-3/7)`
`= 5/9(-4/7 +1/3 + 2/3 - 3/7)`
`= 5/9[(-4/7 -3/7) + (1/3+2/3) ]`
`= 5/9 (-1 +1)`
`= 5/9 . 0`
`= 0`