百分数口算500道急

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÷35＝12,25×12＝300,135÷0.5＝2703/4+1/4=1,2+4/9=22/9,3-2/3=7/3,3/4-1/2=1/41/6+1/2-1/6=1/2,7.5-(2.5+3.8)=1.2,7/8+3/8=5/43/10+1/5=1/2,4/5-7/10=1/10,2-1/6-1/3=1.50.51÷17＝0.03,32.8＋19＝51.8,5.2÷1.3＝4,1.6×0.4＝0.644.9×0.7＝3.43,1÷5＝0.2,6÷12＝0.5,0.87－0.49＝0.38本回答被提问者和网友采纳