a,-4/5×7/12+(-4/5)x(-1/6) b, |-15/2|+3/18-(-5/15)2 c, (2020/4040-1/7)-(-3/21+)-5/12

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1. `a)(-4/5)×7/12+(-4/5)×(-1/6)`

   `=(-4/5)×[7/12+(-1/6)]`

   `=(-4/5)×[7/12+(-2/12)]`

   `=(-4/5)×5/12`

   `=-1/3`

   `b)|-15/2|+3/18-(-5/15)^2`

   `=15/2+3/18-1/9`

   `=135/18+3/18-2/18`

   `=68/9`

   `c)(2020/4040-1/7)-(-3/21)+(-5/12)`

   `=(1/2-1/7)+1/7+(-5/12)`

   `=1/2-1/7+1/7+(-5/12)`

   `=1/2+(-5/12)`

   `=6/12+(-5/12)`

   `=1/12`

    

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2. `a) (-4)/5 xx 7/12 + (-4)/5 xx (-1)/6`

   ` = (-4)/5 xx (7/12 – 1/6)`

   ` = (-4)/5 xx 5/12`

   ` = -1/3`

   `b) |-15/2| + 3/18 – (-5/15)^2`

   ` = 15/2 + 3/18 – 1/9`

   ` =135/18  + 3/18 – 2/18`

   ` = 68/9`

   `c) (2020/4040 – 1/7) – (-3/21) + (-5)/12`

   ` = 1/2 -1/7 + 1/7 – 5/12`

   ` = 1/2 – 5/12`

   ` = 6/12 – 5/12`

   ` = 1/12`

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