解：依题意得算式，64÷0.8=801.4×30-2.7=42-2.7=39.36.5÷4..00=1.6253.8÷0.2=193.8+12.8×0.7=3.8+8.96=12.76即64÷0.8=80，1.4×30-2.7=39.3，6.5÷4..00=1.625，3.8÷0.2=19，3.8+12.8×0.7=12.76
