191919/939393=(19*10101)/(93*10101)=19/9319019/93093=(19*1001)/(93*1001)=19/93190019/930093=(19*10001)/(93*10001)=19/93-2^2=-4所以,原式=(-4)+(19/93+19/93+19/93)=-4+19*3/93=-4+19/31=-(3+12/31)负的3又31分之12 191919/939393=(19*10101)/(93*10101)=19/9319019/93093=(19*1001)/(93*1001)=19/93190019/930093=(19*10001)/(93*10001)=19/93-2^2=-4所以,原式=(-4)+(19/93+19/93+19/93)=-4+19*3/93=-4+19/31=-(3+12/31)负的3又31分之12