7.2+2.8 0.93÷3.1 9-2.8 0.36+0.64 8.4÷0.42 34*0.5 38+29+62 32÷4+6÷2 100（200+9） 5.6×2.9 3.77×1.8 0.02×96 5.22×0.3 3×0.02 4.67×0.9 5×2.44 1.6×6.1 9.432×0.002 5.6×6.5 4.88×2.9 5.61×4.3 8...