如果a和b都是自然数,并满足a/2+b/7=13/14,那么a+b=()?

问题描述:

如果a和b都是自然数,并满足a/2+b/7=13/14,那么a+b=()?
1/()+1/()=5/12
1/()+1/()+1/()=13/18

a/2+b/7=13/14,
7a/14+2b/14=13/14
7a+2b=13
∵a和b都是自然数,
∴a=1,b=3
a+b=4
1/(4)+1/(6)=5/12
1/(2)+1/(6)+1/(18)=13/18