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

Toán Lớp 4: Tính bằng cách thuận tiện a 679 x 85 – 679 x 75 b 625 x 97 + 625 + 625 x 2

Toán Lớp 4: Tính bằng cách thuận tiện
a 679 x 85 – 679 x 75
b 625 x 97 + 625 + 625 x 2

Comments ( 2 )

  1. a) 679 × 85 – 679 × 75
    = 679 × ( 85 – 75 )
    = 679 × 10
    = 6790
    b) 625 × 97 + 625 + 625 × 2
    = 625 × ( 97 + 1 + 2 )
    = 625 × 100
    = 62500

  2. a,679 x 85-679 x 75
    =679 x (85-75)
    =679 x 10
    =6790
    b,625 x 97+625+625 x 2
    =625 x (97+1+2)
    =625 x 100
    =62500
     

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

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