Môn Toán Lớp 6: A) 49.55+45.49-120 B) 120:{54-[50:2-(3^2-2.4 C) 750:{130-[(5.14-65^3)+3]}

2 bình luận về “Môn Toán Lớp 6: A) 49.55+45.49-120 B) 120:{54-[50:2-(3^2-2.4 C) 750:{130-[(5.14-65^3)+3]}”

1. a) 49 . 55 + 45 . 49 -120

   = 49 . (55 + 45) – 120

   = 49 . 100 – 120

   = 4900 – 120

   = 4780

   b) 120 : {54 – [50 : 2 – (3^2 – 2 . 4)]}

   = 120 : {54 – [50 : 2 – (9 – 8)]}

   = 120 : {54 – [50 : 2 – 1]}

   = 120 : {54 – [25 – 1]}

   = 120 : {54 – 24}

   = 120 : 30

   = 4

   c) 750 : {130 – [(5 . 14 – 65^3) + 3]}

   (Câu c sai đề)

   #Leen

   Trả lời
2. A,49.55+45.49-120

   =49.(55+45)-120

   =49.100-120

   =4900-120

   =4780

   B,120:{54-[50:2-(3^2-2.4)]}

   =120:{54-[50:2-(9-8)]}

   =120:{54-[50:2-1]}

   =120:{54-[25-1]}

   =120:{54-24}

   =120:30

   =4

   C,750:{130-[(5.14-65^3)+3]}

   =750:{130-[(5.14-274625)+3]}

   =750:{130-[(60-274625)+3]}

   (Ý C KO Làm ĐƯỢC)

    

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