1.一個數比另一個數大15, 且它們的和是49. 求這两個數.
2.一本書有N 頁, 且書中有五分之一載有卡通圖.如困書中冇7頁有卡通插圖,這本書有多少頁?
3.小明父親的年齡是他的三倍.7年後,他的父親是43歲,問小明現年几多歲?
4.志明買了4本書每本售18元的書,另外買了几支每支售元的原子筆,如果總值是114元,他買了多少支原子筆??
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小學六年級數學一問
2008-08-28 1:11 am
回答 (2)
2008-08-28 1:29 am
✔ 最佳答案
1. A+(A+15)=49 --> 2A=49-15 --> 2A=34 --> A=172. 1/5 N = 7 --> N=7x5=35
3. 3M+7=43 --> 3M=43-7 --> 3M=36 --> M=12
4. 18x4+PEN = 114 --> PEN=114-72=42 (如需知買了多少支原子筆, 只需將42除以原子筆之售價, 便可得知)
2008-08-28 2:40 am
1.)
let x be the smaller number,
x+(x+15)=49
2x=34
x=17
Therefore, the smaller number is 17 while the larger number is 17+15=32.
2.)
N*(1/5)=7
N=35
Therefore, this book has 35 pages.
3.)
let xbe the age of 小明 ,
3x+7=43
3x=36
x=12
Therefore, 小明 is 12 years old.
4.)
let x,y be the price of a pen and the number of pens respectively,
4*18+x*y=114
xy=42
Due to the price of a pen is unknown, we just know that:
(price of a pen)*(number of pens)=42
number of pens=42/(price of a pen)
Thus, the "number of pens" is equal to 42 divide "the price of a pen"
let x be the smaller number,
x+(x+15)=49
2x=34
x=17
Therefore, the smaller number is 17 while the larger number is 17+15=32.
2.)
N*(1/5)=7
N=35
Therefore, this book has 35 pages.
3.)
let xbe the age of 小明 ,
3x+7=43
3x=36
x=12
Therefore, 小明 is 12 years old.
4.)
let x,y be the price of a pen and the number of pens respectively,
4*18+x*y=114
xy=42
Due to the price of a pen is unknown, we just know that:
(price of a pen)*(number of pens)=42
number of pens=42/(price of a pen)
Thus, the "number of pens" is equal to 42 divide "the price of a pen"
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