197*98/97+98/1

问题描述:

197*98/97+98/1
应该是 197*97/98+1/98

197*97/98+1/98
=(197*97+1)/98
=[(2*98+1)(98-1)+1]/98
=[2*98^2-2*98+98-1+1]/98
=(2*98^2-98)/98
=98*(2*98-1)/98
=2*98-1
=196-1
=195