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

Toán Lớp 5: c) 42,05 x 4,66 + 5,34 x42.05 d) 19.5 x125,3 – 19,5 x 25,3 e) 16,25:2,5 + 8,75:2,5

Toán Lớp 5: c) 42,05 x 4,66 + 5,34 x42.05
d) 19.5 x125,3 – 19,5 x 25,3 e) 16,25:2,5 + 8,75:2,5

Comments ( 2 )

  1. c)42,05xx4,46+5,34xx42,05
    =42,05xx(4,46+5,34)
    =42,05xx10
    =420,5
    d)19,5xx125,3-19,5xx25,3
    =19,5xx(125,3-25,3)
    =19,5xx100
    =1950
    e)16,25:2,5+8,75:2,5
    =(16,25+8,75):2,5
    =25:2,5
    =10
     

  2. c, 42,05 xx 4,66 + 5,34 xx 42,05
    = 42,05 xx (4,66 + 5,34)
    = 42,05 xx 10
    = 420,5
    d, 19,5 xx 125,3 – 19,5 xx 25,3
    = 19,5 xx (125,3 – 5,3)
    = 19,5 xx 100
    = 1950
    e, 16,25 : 2,5 + 8,75 : 2,5
    = 16,25 . 2/5 + 8,75 . 2/5
    = 2/5 . (16,25 + 8,75)
    = 2/5 . 25
    = 10
     

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

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