標題:

maths(help!!!)

發問:

The sum of two numbers is 90 and their difference is 44.Find the two numbers. 二個數字的總和是90，並且他們的區別是44.Find二個數字。 須附有步驟!!!

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最佳解答:

Let the bigger be x the smaller be y x+y =90-----[1] x-y =44------[2] From [2], y=x-44---[3] Put [3] into [1] x+ (x-44) =90 x+x-44=90 2x=134 x=67 2011-04-29 20:20:50 補充： Put x=67 into [3] y=67-44 =23 2011-04-29 20:23:45 補充： so that x=67 and y =23

其他解答:

Let x and y are the two numbers. x +y =90 --(1) x - y = 44 --(2) Then, (1) - (2), 2y = 46 y = 23 Sub. y=23 into (1) x +23 = 90 x= 67 So, Two numbers are 23 and 67 respectively. by Jeffrey http://cytc-jeffrey.blogspot.com/
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