8.9x9十0.178十89xO.o98怎样简便计算?8.9×9十0.178十89×O.098=8.9×9十8.9×0.02十8.9×0.98=8.9×(9十0.02十0.98)=8.9×10=89
8.9X9十0.178十89x0.098=8.9x(9+0.02+0.98)=8.9×10=89