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| 2017/07/04 11:25:06瀏覽50｜回應0｜推薦0 | |
| 標題: 聯立二元一次方程的誌應用(plz help!!) 5點 發問: 兩年前，百慧和有和年齡的和是53。10年後，百慧的年齡將是有和的5」6 (6分之5)。百慧今年是多少歲?(我要算式+步驟+答案) 最佳解答:
此文章來自奇摩知識+如有不便請留言告知 Let 百慧 present age = x Let 有和 present age = y 2 years ago, their age is (x - 2) and (y - 2) respectively. so (x - 2) + (y - 2) = 53 x + y = 57 ......................(1) 10 years later, their age is (x + 10) and (y + 10) respectively. so (x + 10) = (5/6)(y + 10) 6(x + 10) = 5(y + 10) 6x + 60 = 5y + 50 6x - 5y = - 10 .................(2) (1) x 5 + (2) we get 11x = 275 x = 275/11 = 25. so百慧 present age = 25.其他解答: |
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| ( 知識學習｜隨堂筆記 ) |
