等于1。原式=(975*579-198)/((975+1)*(579-1)+199)=(975*579-198)/(975*579+579-975-1+199)=(975*579-198)/(975*579+777-975)=(975*579-198)/(975*579-198)=1.
((976-1)*(578+1)-198)/(976*578+199)
=(976*578+976-578-1-198)/(976*578+199)
=(976*578+199)/(976*578+199)
=1
现在小学题目还真难的啊...