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

Toán Lớp 4: 13 × 31 =–…+–…==

Toán Lớp 4: 13 × 31 =………..+………..=…………

Comments ( 2 )

  1. 13xx31=13xx(30+1)=13xx30+13=390+13=403

  2. 13 × 31 = 13 × (30 + 1) = 13 × 30 + 13 × 1 = 390 + 13 = 403.
    Chúc học tốt!!!

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