(6.8-6.8×0.55)÷8.5 0.12× 4.8÷0.12×4.8 6-1.6÷4= 5.38+7.85-5.37= 6.5×（4.8-1.2×4）= 0.68×1.9+0.32×1.9 10.15-10.75×0.4-5.7 0.68×1.9+0.32×1.9 (58+370）÷（64-45） 15-10.75×0.4-5.7 (6.8-6.8×...