✔ 最佳答案
1. 大小兩數的和是96,兩數的差是18,大數係多少?
let x is the bigger value
x + (x-18) = 96
2x-18 = 96
2x=96+18
x = (96+18)/2
2. 乙數是甲數的3倍,甲、乙兩數的和是64,甲數是多少?
let 甲 is a
3a + a = 64
4a = 64
a = 64/4
3. 把55粒波子分成大小兩堆,大堆的數目是小堆的2倍少5粒,兩堆波子各有幾粒?
let s 大堆的 is x
(2x-5) + x = 55
3x - 5 = 55
3x = 60
x = 60/3
then you know what s x. put the x in the formula
大堆的 is 2x -5
4. 某數除以3,加上2,結果是6,某數是多少?
lets 某數 is a
a/3 + 2 = 6
a/3 = 6-2
a = (6-2) X3
5. 重量相等的[for]物,5包的重量和2包的重量相差15公斤,每包[for]物的重量是多少?
let s goods is b
5b-2b = 15
7b = 15
b= 15/7
You work out the final answer. most of the answers have worked out their final stage. I don't work to do the "homework" for you. that s not benefit to you either.
2009-08-17 22:35:11 補充:
correct for Q5:
5b-2b = 15
3b = 15
b = 15/3