1.已知某地圖的比例尺2cm比50km, 請得出地面上兩個相距210km的城市在地圖上的距離。
2.張老太有3個孫兒,他們的年齡分別是9歲,5歲和4歲。她立了一份遺囑,指示當她去世後把$2700000的遺產按孫兒的年齡分給他們。若張老太在立遺囑的
(a)同年去世,問他們各人可得多少遺產?
(b)三年後去世,問他們各得多少遺產?
(c)六年後去世,問他們各人可得多少遺產?
已知一地圖的比例尺是1:250000。
(a)若地圖上兩地的距離是3cm,試得出兩地的實際距離。
(b)地圖上有一條公路長2cm,若一輛汽車以圴速行駛全程只需5分鐘,試得出汽車的速率。(答案以km/h為單位)
help~~比和率問題!!
2007-10-02 5:12 am
回答 (2)
2007-10-02 5:32 am
✔ 最佳答案
1.2 cm = 50 km
so
1 cm = 25 km
1/25 cm = 1 km
250 x (1/25) cm = 250 km
250 km = 10 cm
2.
(a) 大孫兒可得
2 700 000 x 9 / (9 + 5 + 4)
= 2 700 000 x 9 / 18
= 1 350 000元
二孫兒可得
2 700 000 x 5 / 18
= 750 000元
小孫兒可得
2 700 000 x 4 / 18
= 600 000元
(b) 大孫兒可得
2 700 000 x 12 / (12 + 8 + 7)
= 2 700 000 x 12 / 27
= 1 200 000元
二孫兒可得
2 700 000 x 8 / 27
= 800 000元
小孫兒可得
2 700 000 x 7 / 27
= 700 000元
(c) 大孫兒可得
2 700 000 x 15 / (15 + 11 + 10)
= 2 700 000 x 15 / 36
= 1 125 000元
二孫兒可得
2 700 000 x 11 / 36
= 825 000元
小孫兒可得
2 700 000 x 10 / 36
= 750 000元
3.
(a)
1 : 250 000
地圖上1 cm = 實際距離250 000 cm
地圖上1 cm = 實際距離2 500 m
地圖上1 cm = 實際距離2.5 km
地圖上3 cm = 實際距離3x 2.5 km
地圖上3 cm = 實際距離7.5 km
(b)
(a) 部分得知:
地圖上1 cm = 實際距離2.5 km
地圖上2 cm = 實際距離2 x 2.5 km
地圖上2 cm = 實際距離5 km
汽車以圴速行駛全程只需
5分鐘
因60分鐘 = 1小時
故1分鐘 = 1/60小時
5分鐘 = 5 x 1/60小時
5分鐘 = 1/12小時
所以
汽車的速率
= d/t
= 5 / (1/12)
= 60 km/h
2007-10-01 21:34:55 補充：
更正1.2 cm = 50 kmso1 cm = 25 km1/25 cm = 1 km210 x (1/25) cm = 210 km210 km = 8.4 cm
2007-10-02 5:26 am
(1) 2/50 = x/210
x = 8.4 cm
(2)(a)
$2700000/18 = $150000
Age 9 have $150000 X 9 = $1350000
Age 5 have $150000 X 5 = $750000
Age 4 have $150000 X 4 = $600000
(2)(b)
after 3 years, then Age 12, 8, and 7
$2700000/27 = $100000
Age 12 have $100000 X 12 = $1200000
Age 8 have $100000 X 8 = $800000
Age 7 have $100000 X 7 = $700000
(2)(c)
after 6 years, then Age 15, 11, and 10
$2700000/36 = $75000
Age 15 have $75000 X 15 = $1125000
Age 11 have $75000 X 11 = $825000
Age 10 have $75000 X 10 = $750000
(a)
3cm=750000cm
750000cm=7500m
7500m=7.5km
(b)
2cm=5km
5km X 60/5 = 60km/h
x = 8.4 cm
(2)(a)
$2700000/18 = $150000
Age 9 have $150000 X 9 = $1350000
Age 5 have $150000 X 5 = $750000
Age 4 have $150000 X 4 = $600000
(2)(b)
after 3 years, then Age 12, 8, and 7
$2700000/27 = $100000
Age 12 have $100000 X 12 = $1200000
Age 8 have $100000 X 8 = $800000
Age 7 have $100000 X 7 = $700000
(2)(c)
after 6 years, then Age 15, 11, and 10
$2700000/36 = $75000
Age 15 have $75000 X 15 = $1125000
Age 11 have $75000 X 11 = $825000
Age 10 have $75000 X 10 = $750000
(a)
3cm=750000cm
750000cm=7500m
7500m=7.5km
(b)
2cm=5km
5km X 60/5 = 60km/h
收錄日期: 2021-04-13 13:42:46
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