Giúp e với ạ, e cần gấp ạ

Đáp án+Giải thích các bước giải:

Bài `4` :

`a,` `-0,75 : 1,25 = -3/4 : 5/4 = -3/5`
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`b,` `-2/13 : -3,15 = -2/13 : (-63)/20 = 40/819`

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`c,` `1 2/3 : 10/81 = 5/3 : 10/81 = 27/2`
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`d,` `1 3/5 : -4,5 = 8/5 : (-9)/2 = -16/45`
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`e,` `75% : 1 2/5 = 3/4 : 7/5 = 15/28`
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`f,` `1 3/8 : 2 1/11 = 11/8 : 23/11 = 121/184`

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`g,` `1 2/13 : 1 1/26 = 15/13 : 27/26 = 10/9`
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`h,` `1/6 : 2 1/3 = 1/6 :7/3 = 1/14`
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`k,` `( 1 1/3)/(2 1/5)` `= 1 1/3 : 2 1/5 = 4/3 : 11/5 = 20/33`