f2數學2題 - 好簡單!!!

2008-06-01 1:31 am
1. correct 0.0000748km² to the nearest m²
2. make b the subject of the formula k = 1/b - 1/c
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要有詳細步驟~~~
thz everyone~

回答 (3)

2008-06-01 1:44 am
✔ 最佳答案
1.先將 0.0000748 開方 = 0.008648699
然後 x以 1000 因為 1km = 1000m=8.648699324
最後 再將8.648699324自x
=74.8
=75 m²

2.k =1/b - 1/c
bk= 1-b/c
cbk =c-b
cbk+b =c
b(ck+1)= c
b= c/(ck+1)
參考: 自己計
2008-06-01 2:03 am
1

1km = 1000m
(1km)(1km) = (1000m)(1000m)

i.e. 1km² = 1,000,000m²

0.0000748km²
= (0.0000748)(1000000)m²
= 74.8m²

2

k=1/b-1/c
k+1/c=1/b
b(k+1/c)=1
b=1/(k+1/c) or b= 1/k + c


* 1/(1/c) = c/1 = c

既然最後也要in terms of b (即是只有一個b) 過程中盡量不要弄到有幾個b出來 以免增加麻煩

2008-05-31 18:05:51 補充:
002的
b= c/(ck+1) 中的c/(ck+1)
也可以變成 c/ck + c/1 = 1/k+c

2008-05-31 22:29:53 補充:
漏看了1的條件
74.8m² = 75m² (correct to the nearest m²)
2008-06-01 1:37 am
1km=100m
1²2km²=100²m²
1km²=10000m²
0.0000748km²=0.748m²

k = 1/b - 1/c
kbc=1/c-1/b
1/c=kbc-1/b
1/c=b(kc-1)
b=1/c(kc-1)
參考: me


收錄日期: 2021-04-13 15:38:44
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