2.8×0.4＝ 1.1214－7.4＝6.6, 1.92÷0.04＝48, 0.32×500＝160, 0.65＋4.35＝ 510－5.4＝4.6, 4÷20＝0.2, 3.5×200＝700, 1.5－0.06＝1.440.75÷15＝0.05, 0.4×0.8＝0.32, 4×0.25＝1, 0.36＋1.54＝21.01×99＝99...