a/b+b/a=2,则a=b(a²+ab+b²)/(a²+4ab+b²)=(a²+a²+a²)/(a²+4a²+a²)=(3a²)/(6a²)=1/2
a/b+b/a=2通分后去分母得a²+b²=2aba²+ab+b²=2ab+ab=3aba²+4ab+b²=2ab+4ab=6ab所以计算式=1/2
a/b+b/a=2a^2+b^2=2aba=b(a^2+ab+b^2)/(a^2+4ab+b^2)=3/6=1/2