题目内容

数学门诊部。(对的打“√”,错的打“×”并改正)
(1)+×
  =×
  =1

  
(     )
(2)×9+×6
  =(+)×(9+6)
  =×15
  =
(    )
(3)(-)×24
  =×24××24
  = 48
  
  
(    )

(1)×;
+×
=+
=
(2)×;
×9+×6
=3+3
=6
 
(3)×;
-)×24
=×24-×24
=8-6
=2

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