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中一數學問...10分
發問:
The total age of Mr.Chu and his son is 51.Three years ago,he was 8 times as old as his son.How old is his son now? 寫下列式及題,答案是8 更新: P.S 一定要用方程
最佳解答:
let x be mr chu age and y be his son x+y=51...(1) x-3=8(y-3)...(2) from(1),we have x=51-y...(3) sub(3)into (2) 51-y-3=8(y-3) 48-y=8y-24 9y=72 y=8 therefore,his son is 8 years old 2008-03-23 16:51:29 補充： let x be mr chu age and y be his son's
其他解答:
設三年之的兒子為x: (x+3) +(8x+3)=51 x=5 所以他現在的兒子年歲為 x+3=8
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