194-85-82+197-81-80+200-79-78+202-77+207
1个回答

1楼的,你脑子有点死啊,其实就算没打错也能算.

原式=(194+197+200+202+207)-(77+78+...+82+83)-2

=(194+197+200+203+206)-(77+78+...+82+83)-2

=(194+206)*5/2-(77+83)*7/2-2

=1000-560-2

=438