30.8÷[14－(9.85＋1.07)] [60－(9.5＋28.9)]÷0.182.881÷0.43－0.24×3.520×[(2.44－1.8)÷0.4＋0.15]28-(3.4+1.25×2.4) 2.55×7.1+2.45×7.1777×9+1111×30.8×〔15.5-(3.21+5.79)〕（31.8+3.2×4）÷5 31.5×...