98-32-28= 156-19-81= 217-65-135= 345-66-34= 205+87+13= 398-1
2个回答

98-32-28= 98-(32+28)=98-60 = 38

156-19-81=156-(19+81)=156-100=56

217-65-135=217-(65+135)=217-200=17

345-66-34=345-(66+34)=345-100=245

205+87+13=205+(87+13)=205+100=305

398-163-137= 398-(163+137)=398-300=98