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

Toán Lớp 5: tính bằng hai cách:a)102,81×42+102,81×18 b)81,75×3,5+81=?,75×4,5+81,75×2

Toán Lớp 5: tính bằng hai cách:a)102,81×42+102,81×18 b)81,75×3,5+81=?,75×4,5+81,75×2

Comments ( 2 )

  1. a)102,81xx42+102,81xx18
    C_1:102,81xx42+102,81xx18
    =102,81xx(42+18)
    =102,81xx60
    =6168,6
    C_2:102,81xx42+102,81xx18
    =4318,02+1850,58
    =6168,6
    b)81,75xx3,5+81,75xx4,5+81,75xx2
    C_1:81,75xx3,5+81,75xx4,5+81,75xx2
    =81,75xx(3,5+4,5+2)
    =81,75xx10
    =817,5
    C_2:81,75xx3,5+81,75xx4,5+81,75xx2
    =286,125+367,875+163,5
    =817,5

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