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

Toán Lớp 6: tính nhanh A = ( 125,5 + 58,72 ) x ( a x 12,5 – a x 5 – a x 7,5 )

Toán Lớp 6: tính nhanh
A = ( 125,5 + 58,72 ) x ( a x 12,5 – a x 5 – a x 7,5 )

Comments ( 2 )

  1. (125,5+58,72)xx(axx12,5-axx5-axx7,5)
    =184,22xxa(12,5-5-7,5)
    =184,22xxaxx0
    =0
     

  2. A=(125,5+58,72)×(a×12,5-a×5-a×7,5)
    A=(125,5+58,72)×[a×(12,5-5-7,5)]
    A=(125,5+58,72)×a×0
    A=0       

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