【题目】数学诊所。(对的画“√",错的画“×”并改正)
(1)338-55+45 改正:
=338-(55+45)
=338-100
=238 ( )
(2)280÷35 改正:
=280÷7×5
=40×5
=200 ( )
【答案】(1)×
改正:338-55+45
=338-(55-45)
=338-10
=328
(2)×
改正:
280÷35
=280÷(7×5)
=280÷7÷5
=40÷5
=8
【解析】
略

【题目】数学诊所。(对的画“√",错的画“×”并改正)
(1)338-55+45 改正:
=338-(55+45)
=338-100
=238 ( )
(2)280÷35 改正:
=280÷7×5
=40×5
=200 ( )
【答案】(1)×
改正:338-55+45
=338-(55-45)
=338-10
=328
(2)×
改正:
280÷35
=280÷(7×5)
=280÷7÷5
=40÷5
=8
【解析】
略