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

Toán Lớp 5: a x 5,5 +a x 3 +a + 1/2 x a = 90

Toán Lớp 5: a x 5,5 +a x 3 +a + 1/2 x a = 90

Comments ( 2 )

  1. a xx 5,5 + a xx 3 + a + 1/2 xx a = 90
    a xx ( 5,5 + 3 + 1 + 1/2 ) = 90
    a xx 10 = 90
    a = 90 : 10
    a = 9
    Vậy a = 9

  2. a xx 5,5 + a xx 3 + a + 1/2 xx a = 90
    a xx 5,5 + a xx 3 +  a xx 1 +  0,5 xx a = 90
    a xx ( 5,5 + 3 + 1 + 0,5) = 90
    a xx 10 = 90
    a = 90 : 10
    a = 9
    Vậy a = 9

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