$a)  15x + 13y = 20$

$b)  4x - 17y = 8$

$c)  11x + 9y = 20$

$d)  9x - 15y = -12$
Cách cau d tương tự câu c. Nhẩm nghiệm tí nha

Vì $9-15=-6 \Rightarrow 9.2-15.2=-12(1)$

Mặt khác $9x-15y=-12 (2)$

Lấy $(2)-(1) \Rightarrow 9(x-2)-15(y-2)=0$

$\Leftrightarrow 9(x-2)=15(y-2)$

$\Leftrightarrow 3(x-2)=5(y-2) (3)$

$\Rightarrow y-2$ chia hết cho $3$

Đặt $y-2=3k (k \in Z) \Rightarrow y=3k+2$

Thế $y-2=3k  vào  (3)$

$\Rightarrow 3(x-2)=5.3k$

$\Rightarrow x=5k+2$

Vậy $(x;y)=(5k+2;3k+2)$ với $k \in Z$


Câu c
Cái này nhìn vào có thể thấy $11+9=20$

$\Rightarrow 11.1+9.1=20 (1)$

Mà $11x+9y=20 (2)$

$(2) -(1) = 11(x-1) + 9(y-1)=0$

$\Leftrightarrow 11(x-1)=-9(y-1) (3)$

$\Rightarrow y-1$ chia hết cho 11

Đặt $y-1=11t \Rightarrow y=11t+1    (t \in Z)$

Thế vào $(3),$ ta có $11(x-1)=-99t$

$\Leftrightarrow x-1=-9t$

$\Leftrightarrow x=1-9t$

Vậy $(x;y)=(1-9t;11t+1)$ với $t \in Z$


Câu a) Ta thấy 15 và 20 đều chia hết cho 5 $\Rightarrow 13y$ chia hết cho 5 $\Rightarrow y$ chia hết cho 5
Đặt $y=5t$ thay vào ta được: $3x+13t=4\Rightarrow x=\frac{4-13t}{3}$
Vậy pt có vô số nghiệm nguyên $(x;y)=(\frac{4-13t}{3};5t), t\in Z$
Câu b) Tương tụ thấy 8 và 4 đều chia hết cho 4$\Rightarrow y$ chia hết cho 4
Đặt $y=4t$ thay vào $\Rightarrow 4x-17.4t=8\Rightarrow x=2+17t$
Vậy pt có vô số nghiệm nguyên $(2+17t;4t), t\in Z$

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