问题
解答题
寻找失去的数(先画树状算图,再用逆推法求,最后用计算器验算).
(1)22.8+□-9.125=18.905
(2)13.09-(□-3.45)=3.26
(3)□-29.35+73.51=90
(4)366-(□+63.59)=125.3.
答案
(1)22.8+5.23-9.125=18.905;
(2)13.09-(13.28-3.45)=3.26;
(3)45.84-29.35+73.51=90;
(4)366-(177.11+63.59)=125.3;
故答案为:5.23,13.28,45.84,177.11.