直接写出得数.998+889= 380﹣279= 5.9﹣0.89== = 0.25×4=1÷0.125= =
999×999﹣2×999+1.
2.5×(1.9+1.9+1.9+1.9)
÷20.
2008×+200.8×4.3+20.08×8.
3.142+68.6×0.314.