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

Toán Lớp 5: Câu 1 tìm x a, x/6=5/6 b,12+x/42=5/6 c, 25-x/40= 3/8

Toán Lớp 5: Câu 1 tìm x
a, x/6=5/6 b,12+x/42=5/6 c, 25-x/40= 3/8

Comments ( 2 )

  1. a ) x/6 = 5/6
    => x = 5
    b ) 12 + x/42 = 5/6
    x/42 = 5/6 – 12
    x/42 = -67/6
    x/42 = -469/42
    => x = -469
    c ) 25 – x/40 = 3/8
    x/40 = 25 – 3/8
    x/40 = 197/8
    x/40 = 985/40
    => x = 985
    #dtkc
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     a) x/6=5/6
    ⇔ x=5
    b) 12+x/42=5/6
    ⇔          x/42=5/6-12
    ⇔          x/42= -67/6
    ⇔           x/42=-469/42
    ⇔         x        = -469
    c) 25-x/40=3/8
    ⇔ x/40 = 25 -3/8
    ⇔ x/40 = 985/40
    ⇔ x=985

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

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