7.28×99+7.284.3×50×0.64－2.64×0.×0.28

3.94+34.3×0.2

8.9×1.1×4.7

32＋4.9－0.9

4.8×100.1

12.5×0.4×2.5×8

2.7×5.4×3.6.58×4.5×0.9×810.8－0.8×7.0 0.87×3.16+4.641.2×÷4.8.6×9.85-5.466.5×99＋56.54。