F.1 Maths :
Francis plans to border a farmland by fences of equal length. If 16 fences are used, there will be 66cm short. If 21 fences are used, there will be an excess of 99cm. Find the length of each fence.
F.1 Maths :?
2016-12-30 3:56 pm
回答 (2)
2016-12-30 7:47 pm
let x be the length of the fence
let y be the length of the side of the farmland
16x=y-66
21x=y+99
16x-y=-66-----[1]
21x-y=99------[2]
16x+66=y
21x-16x+66=99
5x=165
x= 33
y=594
let y be the length of the side of the farmland
16x=y-66
21x=y+99
16x-y=-66-----[1]
21x-y=99------[2]
16x+66=y
21x-16x+66=99
5x=165
x= 33
y=594
2016-12-30 4:03 pm
let x be the length of the fence
let y be the length of the side of the farmland
16x=y-66
21x=y+99
16x-y=-66_________[1]
21x-y=99__________[2]
[2]-[1]
5x=165
x=33
let y be the length of the side of the farmland
16x=y-66
21x=y+99
16x-y=-66_________[1]
21x-y=99__________[2]
[2]-[1]
5x=165
x=33
收錄日期: 2021-04-18 15:59:28
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