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问题: Add Maths

Given that the perimeter of a rectangle is 34cm and its area is 72cm. Find the length and the breadth of the rectangle.

解答:

设长为x,宽为72/x
2(x+72/x)=34
(x²+72)/x=17
x²-17x+72=0
(x-9)(x-8)=0
x=9 或 8
所以长为9cm宽为8cm.