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

Toán Lớp 6: Tìm các cặp x , y khác 0 thỏa mãn ( 2x-1) ( y+3 ) = -5 A.1 B.2 C.3 D.4

Toán Lớp 6: Tìm các cặp x , y khác 0 thỏa mãn ( 2x-1) ( y+3 ) = -5
A.1 B.2 C.3 D.4

Comments ( 2 )

  1. Answer
    $\text{Vì}$ x , y \in ZZ $\text{nên}$ 2x – 1 , y + 3 \in ZZ
    => 2x – 1 , y + 3 \in ư(-5) = {+-1 ; +-5}
    $\text{Lập bảng giá trị:}$
    $\begin{array}{|c|c|c|}\hline 2x – 1&1&5&-1&-5\\\hline y + 3&-5&-1&5&1\\\hline x&1&3&0&-2\\\hline y&-8&-4&2&-2\\\hline \text{Thử lại}&\text{TM}&\text{TM}&\text{TM}&\text{TM}\\\hline\end{array}$
    $\text{Vậy}$ (x , y) = (1 , -8) ; (3 , -4) ; (0 , 2) ; (-2 , -2)
    => $\text{Chọn}$ bbD

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

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