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標題:
簡單數學一題
發問:
最佳解答:
Let his age be X now. x+17=2(x-13) x+17=2x-26 x=43 So his age is 43 now.
其他解答:
Let the man's present age be x. Then his age after 17 years = x + 17 and his age 13 years ago = x - 13. 2 (x - 13) = x + 17 => 2x - 26 = x + 17 => 2x - x = 17 + 26 => x = 43 The man's present age is 43.|||||17*2-13 =34-13 =21
簡單數學一題
發問:
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In 17 years a man's age will be twice his age 13 years ago.What is his present age?最佳解答:
Let his age be X now. x+17=2(x-13) x+17=2x-26 x=43 So his age is 43 now.
其他解答:
Let the man's present age be x. Then his age after 17 years = x + 17 and his age 13 years ago = x - 13. 2 (x - 13) = x + 17 => 2x - 26 = x + 17 => 2x - x = 17 + 26 => x = 43 The man's present age is 43.|||||17*2-13 =34-13 =21
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