Tính nhanh 53 – 6 – 4 + 7 – 3 + 8 – 7 – 12

2 bình luận về “Tính nhanh 53 – 6 – 4 + 7 – 3 + 8 – 7 – 12”

1. 53 – 6 – 4 + 7 – 3 + 8 – 7 – 12

   = 53 – ( 6 + 4 ) – ( 3 + 7 ) – ( 12 + 8 )

   = 53 – ( 10 + 10 ) – 20

   = 53 – ( 20 + 20 )

   = 53 – 40

   = 13

   @uyennhi4A4nguyendu

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2. 53 – 6 – 4 + 7 – 3 + 8 – 7 – 12

   =47-4 + 7 – 3 + 8 – 7 – 12

   =43 + 7 – 3 + 8 – 7 – 12

   =50 – 3 + 8 – 7 – 12

   =47 + 8 – 7 – 12

   =55- 7 – 12

   =48-12

   =36

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