UC知道数学难题！！！（英文+数学）
来源：百度知道 编辑：UC知道 时间：2024/06/23 23:37:26
老师让我们做一道难题，而且一定要做
小女实在不才
请各位数学高手献策！！！
find the factor
digit number is 3 times the sum of its digits.
If the 2 digits are reveresed， the number is x times the sum of its digits.
what is the value of X ?
上面有一个单词打错了！！！！！！
这是正确的！！！！！！！！！！
digit number is 3 times the sum of its digits.
If the 2 digits are reversed， the number is x times the sum of its digits.
what is the value of X ?
小女实在不才
请各位数学高手献策！！！
find the factor
digit number is 3 times the sum of its digits.
If the 2 digits are reveresed， the number is x times the sum of its digits.
what is the value of X ?
上面有一个单词打错了！！！！！！
这是正确的！！！！！！！！！！
digit number is 3 times the sum of its digits.
If the 2 digits are reversed， the number is x times the sum of its digits.
what is the value of X ?
from digit number is 3 times the sum of its digits.
we can see that it's a 2 digit number m is十位数 and n is个位数
10m+n=3(m+n)
from second line
we can use the reverse of m&n
10n+m=x(m+n)
then add these two eqn. up
11m+11n=(x+3)(m+n)
11(m+n)=(x+3)(m+n)
11=x+3
x=8
A two-digit number is 3 times the sum of its digits.
If the 2 digits are reversed， the number is x times the sum of its digits.
一个两位数是它每位数之和的三倍。
如调换这个两位数的数字位置，问它是原数每位数之和的多少倍。
答：27=3*(2+7)
72=9x --> x=8
翻译:一个两位数,是其各位数字之和的三倍.交换个位与十位.所得是各位数字之和的x倍.求x.
10a+b=3(a+b)
7a=2b
a=2 b=7
10a+b=27
a+b=9
x=(10b+a)/(a+b)=8