✔ 最佳答案
Are there supposed to be parentheses in the expression?
If not, you would first divide 1/2 by 1/5:
(1/2) / (1/5)
Invert and multiply:
(1/2) * 5 = 5/2
You'd next subtract that from 9/11:
9/11 - 5/2
Make the into fractions with a common denominator:
18/22 - 55/22 = -37/22
Finally, add that to 7/22:
-37/22 + 7/22 = -30/22 which reduces to -15/11 or -1 4/11 as a mixed number.
If the problem is actually (9/11 - 1/2) ÷ (1/5 + 7/22), you'd need to figure each term separately:
(18/22 - 11/22) / (22/110 + 35/110)
(7/22) / (57/110)
Invert and multiply:
(7/22) * (110/57)
770 / 1254 which reduces to 385 / 627 (This may reduce further.)
