[Toán 9] Phương trình nghiệm nguyên

P

pinkylun

$3x + 7y = 55$

$<=>x=\dfrac{55-7y}{3}$

$<=>x=18-2y+\dfrac{1-y}{3}$

Đặt $\dfrac{1-y}{3}=t$ ( $t \in Z $ )

$=>y=1-3t$

$=>x=18-2y+\dfrac{1-1+3t}{3}=18-2+6t+t=16+7t$ :)
 
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