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

Toán Lớp 7: a) 3 mũ 4 x (1/3)mũ 4 b) 12/7 : 15/7

Toán Lớp 7: a) 3 mũ 4 x (1/3)mũ 4 b) 12/7 : 15/7

Comments ( 2 )

  1. Answer
    a,
    3^{4} xx (1/3)^{4}
    = (3 xx 1/3)^{4}
    = 1^4
    = 1
    _________________
    b,
    12/7 : 15/7
    = 12/7 xx 7/15
    = {12xx\cancel{7}}/{\cancel{7}xx15}
    = 12/15
    = 4/5

  2. a) 3^4 x (1/3)^4
    =81 x 1/81
    =81:81
    =1
    b)12/7:15/7
    =12 x 7 : 15 x 7
    =84:105
    =0,8
       Chúc bạn học tốt!!
     

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

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