M=N
M=a/(a+1)+b/(b+1)
=[a(b+1)+b(a+1)]/(a+1)(b+1)
=[ab+a+ab+b]/(ab+a+b+1)
=(2ab+a+b)/(ab+a+b+ab)
=1
N=1/(a+1)+1/(b+1)
=(b+1+a+1)/(a+1)(b+1)
=(b+ab+a+ab)/(ab+b+a+1)
=1
M=N
M=a/(a+1)+b/(b+1)
=[a(b+1)+b(a+1)]/(a+1)(b+1)
=[ab+a+ab+b]/(ab+a+b+1)
=(2ab+a+b)/(ab+a+b+ab)
=1
N=1/(a+1)+1/(b+1)
=(b+1+a+1)/(a+1)(b+1)
=(b+ab+a+ab)/(ab+b+a+1)
=1