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

Toán Lớp 8: tìm các số nguyên x,y thoả mãn xy-5x=2y-10=31

Toán Lớp 8: tìm các số nguyên x,y thoả mãn xy-5x=2y-10=31

Comments ( 1 )

  1. xy-5x=2y-10=31
    TH1:
    2y=31+10
    <=> 2y=41
    <=> y=41/2
    TH2:
    x . 41/2 -5x=2 . 41/2 -10
    <=> 31/2 x=2 . 41/2 -10
    <=> 31/2 x=41-10
    <=> 31/2 x=31
    <=> x=2
    Vậy x;y=41/2 ; 2

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

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