a)-5.9+15.9 b)72+(54)(200)+(72)46

2 bình luận về “a)-5.9+15.9 b)72+(54)(200)+(72)46”

1. a) -5 x 9+15 x 9

   = -45 + 135

    = 90

   b) 72 + (−54) − (−200) + (−72) − 46

   = 72 − 54 + 200 − 72 − 46

   = ( 72−72 ) − ( 54+46 ) + 200

   =−100 + 200

   = 100

   Trả lời
2. a)-5.9+9.15

   =9.(-5+15)

   =9.10=90

   b)72+(-54)-(-200)+(-72)-46

   =72-54+200-72-46

   =(72-72)-(54+46)+200

   =-100+200=100

   Trả lời