a) 13 1/4 : (-5/7) – 18 1/4 : (5/7) b) (7+ 3/2 – 1/3) -( 1/2 + 2/3 -2) -(5 + 1/3) tính giúp mk vs nhank , cần gấp

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1. Đáp án+Giải thích các bước giải:

   `a)`

    `13(1)/4:(-5)/7-18(1)/4:5/7`

   `=13(1)/4.(-7)/5+18(1)/4.(-7)/5`

   `=-7/5(13(1)/4+18(1)/4)`

   `=-7/5(13+1/4+18+1/4)`

   `=-7/5(13+18+1/4+1/4)`

   `=-7/5(31+1/2)`

   `=-7/5.(63)/2`

   `=(-7.63)/(5.2)`

   `=-441/10`

   `b)`

   `(7+3/2-1/3)-(1/2+2/3-2)-(5+1/3)`

   `=7+3/2-1/3-1/2-2/3+2-5-1/3`

   `=(7-5+2)+(3/2-1/2)+(-1/3-2/3-1/3)`

   `=(9-5)+2/2+(-3/3-1/3)`

   `=4+1-4/3`

   `=5-4/3`

   `=(15-4)/3`

   `=11/3`

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