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

Toán Lớp 1: A = 145 × 99 + 145 B = 143×102-143×2

Toán Lớp 1: A = 145 × 99 + 145
B = 143×102-143×2

Comments ( 2 )

  1. A=145xx99+145
    A=145xx99+145xx1
    A=145xx(99+1)
    A=145xx100
    A=14500
    ——
    B=143xx102-143xx2
    B=143xx(102-2)
    B=143xx100
    B=14300

  2.  A=145×99+145×1
    A=145×(99+1)
    A=145×100
    A=14500
     B=143×102-143×2
    B=143×(102-2)
    B=143×100
    B=14300

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

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