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

Toán Lớp 6: Tính hợp lí a,25.15+47.95+25.38-47.70 b,(2^3.9^3+9^2.45):(9^2.15-2.9^2)

Toán Lớp 6: Tính hợp lí
a,25.15+47.95+25.38-47.70
b,(2^3.9^3+9^2.45):(9^2.15-2.9^2)

Comments ( 2 )

  1. a) 25.15 + 47.95 + 25.38 – 47.70
    = (25.15 + 25.38) + (47.95 – 47.70)
    = 25.(15 + 38) + 47.(95 – 70)
    = 25.53 + 47.25
    = 25.(53 + 47)
    = 25.100 = 2500
    b) (2^3.9^3 + 9^2.45) : (9^2.15 – 2.9^2)
    = (8.9.9^2 + 9^2.45) : [9^2.(15 – 2)]
    = (72.9^2 + 9^2.45) : (81.13)
    = (72 + 45).9^2 : 1053
    = 117.81 : 1053
    = 9477 : 1053
    = 9
     

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

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