MATHS
2011-08-10 2:16 am
A piece of string is 40 centimeters long. It is cut into three pieces. The longest piece is 3 times as long as the middle-sized piece and the shortest piece is 23 centimeters shorter than the longest piece. Find the lengths of the three pieces.
回答 (3)
2011-08-10 2:27 am
let x be the length of the middle-sized piece.
x+3x+(3x-23)=40
7x-23=40
7x=63
x=9
length of the longest piece=3*9=27cm
length of the middle-sized piece=9 cm
length of the shortest piece=27-23=4 cm.
x+3x+(3x-23)=40
7x-23=40
7x=63
x=9
length of the longest piece=3*9=27cm
length of the middle-sized piece=9 cm
length of the shortest piece=27-23=4 cm.
參考: me
2011-08-10 2:25 am
the lengths of the middle-sized piece:x
the longest piece:3x
the shortest piece:3x-23
______________________________________
x+3x+3x-23=40
7x=63
x=9
_______________________
the lengths of the middle-sized piece:9cm
the longest piece:27cm
the shortest piece:4cm
______________________________________
the longest piece:3x
the shortest piece:3x-23
______________________________________
x+3x+3x-23=40
7x=63
x=9
_______________________
the lengths of the middle-sized piece:9cm
the longest piece:27cm
the shortest piece:4cm
______________________________________
2011-08-10 2:24 am
Let x be the middle sized piece,
3x be the longest piece,
3x-23 be the shortest piece
3x+3x-23+x=40
7x=63
x=9
Shortest: 3(x)-23=4 cm
Middle-sized: 9 cm
Longest: 3(9)=27 cm
Hope that I can help you :D
3x be the longest piece,
3x-23 be the shortest piece
3x+3x-23+x=40
7x=63
x=9
Shortest: 3(x)-23=4 cm
Middle-sized: 9 cm
Longest: 3(9)=27 cm
Hope that I can help you :D
參考: Myself~
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