各位知識朋友 , 入黎幫我手 ar !!! ( 數學 F.1 ) (55)
2008-02-04 5:10 am
各位知識朋友 , 入黎幫我手 ar !!!
我有幾條數學問題唔識 , 幫手解答 ar( 數學 F.1 )!!!!!!!!!!!!!!!
1. The area of rectangle ABCD is 32 cm² . The length of AB is twice that of AD. Find the lengths of AB and AD.
2. A solid rectangular iron block of 64 cm long , 27cm wide and 8 cm high is melted and recast into an iron cube . Find the length of each of the iron cube.
回答 (1)
2008-02-04 5:32 am
✔ 最佳答案
1.Let the length of AB and AD be 2x cm and x cm rspectively
AB*AD=The area of rectangle ABCD
(2x)(x)=32
x^2=16
x=4
Therefore, the length of AB and AD be 8 cm and 4 cm rspectively
2.
The volume of A solid rectangular iron block of 64 cm long , 27cm wide and 8 cm high
=64*27*8
=13824cm^3
the length of each of the iro n cube
=3√13824
=24cm
收錄日期: 2021-04-25 17:17:56
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