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

Toán Lớp 6: tìm x biết : 13/15-(13/21+x).7/12=7/10 làm theo kiểu tìm x thông thường ạ

Toán Lớp 6: tìm x biết :
13/15-(13/21+x).7/12=7/10
làm theo kiểu tìm x thông thường ạ

Comments ( 2 )

  1. 13/15 – (13/21+x) . 7/12 = 7/10
    => (13/21+x) . 7/12 = 13/15 – 7/10
    -> (13/21+x)  . 7/12 = 1/6
    -> 13/21 +x = 1/6 : 7/12 = 2/7
    -> x = 2/7 – 13/21
    -> x = 6/21- 13/21
    -> x = -7/21 = -1/3
    Vậy x = -1/3

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

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