S1升S2 MATH (20點)

[匿名]

2012-07-18 7:03 am

要步驟thx.
1)
(a) (-5)+(-8)-(+3)　(b) (-5)+[10-(-9)]　(c) -1-(+1/3)+(-2/3)
(d) (+35)÷(+7)×(-8)　(e) (+124)(-2)(-2)/(-8)(+31)　(f) [(-16)-(-8)]÷[(+14)-(-18)]

2)A restaurant had a monthly loss of $12 000 in the first five months after the grand opening. In the next seven months, it had a monthly profit of $5 000.
(a) What was the profit/loss in the first year after the grand opening of the restaurant?
(b) It is known that the restaurant had a monthly profit of $10 000 in the sccond year. If the profit/loss of the restaurant is shared equally between two shareholds, find the total amount shared by each of them for these two years.

回答 (1)

fooks

2012-07-18 11:34 am

✔ 最佳答案

1)
(a)
(-5) + (-8) - (+3)
= -5 - 8 - 3
= -16

(b)
(-5) + [10 - (-9)]
= -5 + [10 + 9]= -5 + 19
= 14

(c)
-1 - (+1/3) + (-2/3)
= -1 - (1/3) - (2/3)
= -2

(d)
(+35) ÷ (+7) × (-8)
= 35 ÷ 7 × (-8)
= 5 × (-8)
= -40

(e)
124 × (-2) × (-2) / (-8) × 31
= 496 / (-248)
= -2

(f)
[(-16) - (-8)] ÷ [(+14) - (-18)]
= [-16 + 8] ÷ [14 + 18]
= (-8) ÷ 32
= -1/4

2)
(a)
Total loss of first five months
= $12000 x 5
= $60000

Total profit of the next seven months
= $5000 x 7
= $35000

Total loss > Total profit

Loss in the first year
= $(60000 - 35000)
= $25000

(b)
Total profit in the first two years
= $(10000 x 12 - 25000)
= $95000

Total amount shared by each of them for these two years
= $95000 ÷ 2
= $47500

參考: fooks

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