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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 5: Tính hiệu sau bảng cách thuận tiện nhất 20-123-4-5-6-7-8-9-10

Toán Lớp 5: Tính hiệu sau bảng cách thuận tiện nhất
20-123-4-5-6-7-8-9-10

Comments ( 2 )

  1. 20-123-4-5-6-7-8-9-10
    Sửa đề:
    20-1-2-3-4-5-6-7-8-9-10
    =20-(1+2+3+4+5+6+7+8+9+10)
    =20-[(9+1)+(8+2)+(7+3)+(6+4)+5+10]
    =20-[10+10+10+10+10+5]
    =20-55
    =-35

  2. 20 – 123 – 4 – 5 – 6 – 7 – 8 – 9 – 10
    = 20 – (123 + 7) – (4 + 6) – 10 – (5 + 8 + 9)
    = 20 – 130 – 10 – 10 – 22
    = 20 – 130 – (10 + 10) – 22
    = 20 – 130 – 20 – 22
    = (20 – 20) – (130 + 22)
    = 0 – 152
    = -152

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222-9+11+12:2*14+14 = ? ( )

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