0.89×0.48+0.89×0.52          0.25×13.7×0.4               4.2×101
3.6×99                        2.5×32×1.25                 0.125×88
56.5×99+56.5                 （1.25﹣0.125）×8             45÷0.09÷0.5
17.8÷（1.78×4）