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

Toán Lớp 4: 86 x 12 + 70 x 25 + 70 x 40 + 70 x 23 tính bằng cách thuận tiện nhất

Toán Lớp 4: 86 x 12 + 70 x 25 + 70 x 40 + 70 x 23
tính bằng cách thuận tiện nhất

Comments ( 2 )

  1. 86 x 12 + 70 x 25 + 70 x 40 + 70 x 23

    = 86 x 70 x ( 12 + 25 + 40 + 23 )

    = 86 x 70 x 100

    = 86 x ( 70 x 100 )

    = 86 x 7000

    = 602000

  2. 86 x 12 + 70 x 25 + 70 x 40 + 70 x 23

    = (70+16) x 12 + 70 x 25 + 70 x 40 + 70 x 23

    = 70 x 12 + 70 x 25 + 70 x 40 + 70 x 23 + 16 x 12

    = 70 x ( 12 + 25 + 40 + 23 ) + 192

    = 70 x 100 + 192

    = 7000 + 192

    = 7192

     

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

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