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

Toán Lớp 6: tìm số nguyên x , y biết : (x+1).(y-2)=5

Tháng Ba 31, 2023 Toán học 0 Comments 0 views

Toán Lớp 6: tìm số nguyên x , y biết : (x+1).(y-2)=5

Comments ( 1 )

  1. truongankimtrong
    truongankimtrong
    31 Tháng Ba, 2023 at 10:11 sáng
    Reply
    Trả lời:
    (x+1).(y-2)=5
    $\text{Ta có:}$
    5=1.5=5.1=(-5).(-1)=(-1).(-5)
    $\text{TH1:}$
    x+1=1
    =>x=0
    y-2=5
    =>y=7
    $\text{TH2:}$
    x+1=5
    =>x=4
    y-2=1
    =>y=3
    $\text{TH3:}$
    x+1=-1
    =>x=-2
    y-2=-5
    =>y=-3
    $\text{TH4:}$
    x+1=-5
    =>x=-4
    y-2=-1
    =>y=1
    $\text{Vậy}$ x in {0;4;-2;-4};y in {7;3;-3;1}

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

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