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

Toán Lớp 8: Cho m< n hãy so sánh -7m +10 và -7n+10

Toán Lớp 8: Cho m< n hãy so sánh -7m +10 và -7n+10

Comments ( 2 )

  1. m<n
    ↔7m<7n
    ↔-7m> -7n
    ↔-7m+10> -7n+10
    Vậy -7m+10> -7n+10↔m<n

  2. Vì m<n
    ->7m<7n
    ->-7m> -7n
    ->-7m+10> -7n+10
    Vậy -7m+10> -7n+10

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