`a,(2/3)^2+3/2×(15/19)^0-1 1/3.(5/12)^1`
`=4/9+3/2-4/3+5/12`
`=37/36`
`b, 7 9/19+3/8+2 10/19-2,375`
`=(7 9/19+2 10/19)+3/8-19/8`
`=10-2=8`
`c,7/5:(-4/5)+2 1/2:(-4/5)+(-1)^2016`
`=-7/4-25/8+1`
`=-39/8+1=-31/8`
`d,sqrt{121}+sqrt{1 7/9}-+6sqrt{(-1/3)^2}`
`=11+4/3-6/3`
`=31/3`
