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急!國一數學 二元一次方程式 (((20點)))
Feb 22nd 2014, 03:54

1.已知x+y=15,原數為10y+x,個位和十位互換後的新數為10x+y
且0<x<10,0<y<10,x,y皆為整數
依題意列式:10x+y=10y+x-27
化簡後得:9y-9x=27
同除9得:y-x=3
列二元一次方程式:
y-x=3
x+y=15
則2y=18
y=9
x=6

Ans:(1):x+y15
(2):原數可寫成:10y+x
(3):新數可寫成:10x+y
(4):由新舊兩數相差27的關係可列式:10x+y=10y+x-27
(5):原數為:96

2.某廠牌內衣分大中小三種,大號85元,中號70元,小號50元
因物價上漲,商擬將內衣售價依原訂價乘a倍後,再加b元來調整
調整後大號為104元,小號為62元。
此為線型函數y=f(x)=ax+b的題目
設y=f(x)=ax+b
則依題意得二元一次方程式:
104=85a+b
62=50a+b
得35a=42
a=1.2
b=2
得線型函數方程式y=f(x)=1.2x+2
中號=84+2=86(元)

Ans:(1)a=1.2,b=2
(2)中號=86元

參考資料: 自己

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