13¼:(-5/7)-18¼:5/7 (7+3/2-1/3)-(1/2+2/3-2)-(5+1/3)

0 bình luận về “13¼:(-5/7)-18¼:5/7 (7+3/2-1/3)-(1/2+2/3-2)-(5+1/3)”

1. Đáp án:

    tham khảo

   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`

   `=(13(1)/4+18(1)/4)×(-7)/5`

   `=31(1)/2×(-7)/5`

   `=-44(1)/10`

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

   `=4+1-4/3`

   `=5-4/3`

   `=11/3`

   Bình luận

2. Đáp án:

   $1/$ `13 1/4 : (-5/7) – 18 1/4 : 5/7`

   `= 53/4 : (-5)/7 – 73/4 : 5/7`

   `= (-53)/4 . 7/5 – 73/4 . 7/5`

   `= 7/5 . ( (-53)/4 – 73/4)`

   `= 7/5 . (-126)/4`

   `= (-441)/10`

   $2/$ `(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 + 2 – 5) + (3/2 – 1/2) + (-1/3 – 2/3 – 1/3)`

   `= 4 + 1 + (-4)/3`

   `= 5 + (-4)/3`

   `= 11/3`

    

   Bình luận