小六簡單數學~~~

2008-06-03 6:30 am
運偷車的輪每轉動50次,運偷車可行走62.8米,運偷車輪的半徑是多少厘米?

回答 (8)

2008-06-03 5:16 pm
✔ 最佳答案
運輸車的半徑是:
(62.8/3.14)/(50*2)*100
=0.20*100
=20(cm)

2008-06-07 13:21:50 補充:
另一方法:設運車的半徑是rcm,
2(3.14)(r)=62.8*100/50
6.28r=6280/50
6.28r=125.6
r=20
所以運輸車的半徑為20cm.
2008-06-04 8:51 am
同學你打左字...
係運輸車
唔係運偷車"
2008-06-04 4:14 am
運偷車輪的半徑是:
62.8x100/50/3.14/2
=6280/50/3.14/2
=125.6/3.14/2
=40/2
=20厘米
2008-06-03 6:41 am
62.8米=6280厘米

6280cm /50 /3.14 /2

=125.6cm /3.14 /2

=40cm /2

=20cm
參考: me
2008-06-03 6:40 am
2r(3.14)(50)=6280

2r(3.14)=6280/50

2r(3.14)=125.6

2r=125.6/3.14

2r=40

r=20
2008-06-03 6:39 am
由於圓周為2rx3.14~所以2rx3.14=62.8/50
r=0.2(二位有效x字)
2008-06-03 6:36 am
運輸車輪的半徑:62.8 x 100 / 50 / 3.14 / 2
= 20 厘米
2008-06-03 6:33 am
62.8/50
3.14r*r==62.8/50


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