✔ 最佳答案
1.
X - 18 × 5 = 24
X - 90 = 24
X = 114
2.
(52 + 18) × X = 140
70X = 140
X = 2
3.
9 ÷ U + 4 × 5 = 23
9 ÷ U + 20 = 23
9 ÷ U = 3
U = 3
4.
(55 - y) × 24 = 600
55 - y = 25
y = 30
5.
(f + 3) × 4 = 36
f + 3 = 9
f = 6
6.
(9 - k) × 2 = 12
9 - k = 6
k = 3
7.
18 × s ÷ 36 = 28
18s = 1008
s = 56
8.
(w + 11) ÷ 6 = 9
w + 11 = 54
w = 43
9.
(7 + i ÷ 30) × 8 = 72
7 + i ÷ 30 = 9
i ÷ 30 = 2
i = 60
10.
80 - 2 × (k - 13 × 2) = 52
80 - 2 × (k - 26) = 52
2 × (k - 26) = 28
k - 26 = 14
k = 40
1.
(24又2/15) - (8又2/3) - (6又4/5)
= (362/15) - (26/3) - (34/5)
= (362/15) - (130/15) - (102/15)
= 130/15
= 8又2/3
2.
(3又2/15) - [(1又2/3) - (1/9)]
= (47/15) - [(5/3) - (1/9)]
= (47/15) - [(15/9) - (1/9)]
= (47/15) - (14/9)
= (141/45) - (70/45)
= 71/45
= 1又26/45
3.
(3又1/7) ÷ (11/7) ÷ (1又3/4)
= (22/7) ÷ (11/7) ÷ (7/4)
= (22/7) x (7/11) x (4/7)
= 8/7
= 1又1/7
4.
(11又1/4) ÷ [(4又1/2) × (2又4/7)]
= (45/4) ÷ [(9/2) x (18/7)]
= (45/4) ÷ (81/7)
= (45/4) x (7/81)
= 35/36