Răspuns:
1/a+1/aa=1/a+1(10a+a)=1/a+1/11a=(11+1)11a=12/11a
1/b+1/bb=1/b+1(10b+b)=1/b+1/11b=(11+1)/11b=12/11b
12/11a:12/11b=12/11a*11b/12=b/a
Explicație pas cu pas:
