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＝99.99,420÷...