问题 解答题 203+347=4-1.7=0.28÷0.01=1.7×0.4=1-=1-311=25÷10=37+58+38+47=45×58= 答案 203+347=550,4-1.7=2.3,0.28÷0.01=28,1.7×0.4=0.68,1-311=811,25÷10=125,37+58+38+47=2,45×58=12.