沪教版三年级数学上册,登月,航天第一人是谁？,前往飞船,一层,整百数的加减法,600,800,900,900,二层,+10,690,700,710,720,500,500,500,600,做题之前先观察,三层,740,750,148,100,898,612,295,591,巧算,四层,4 X 9 + 5 X 9,四层,9,81,2,6,12 X 7 14 X 9 = X 7 + X 7 = X 9 + X 9= + = += =,2,84,70,14,10,126,90,36,10,4,小胖 小丁丁36 18 3 36 18 3 = 18 3 = 36 6 = 6 = 30,7,5,1,2,5,4,61,62,60,61,40,41,43,35,28,2,21,32,6,
