solve that match: find x know: x+2y=3, x>2y, x,y ∈N*

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1. $x+2y=3$

   $\Leftrightarrow x=3-2y$

   $x\in \mathbb{N^*}$

   $\Rightarrow x\ge 1$

   $\Rightarrow 3-2y\ge 1$

   $\Leftrightarrow y\le 1$

   $y\in \mathbb{N^*}\Rightarrow y\in \{1\}$

   If $y=1$, $x=3-2.1=1$ ($x>2y$, incorrect)

   $\Rightarrow S=\{ \varnothing\}$

   Trả lời

2. Đáp án:

   \( x,y \in (\varnothing; \varnothing)\)

   Giải thích các bước giải:

   \(x+2y=3\\\to x=3-2y\)

   Because \(x\in \mathbb N^*\) so \(x\ge 1\)

   \(\to 3-2y\ge 1\to 2y\le 2\to y\le 1\to y=1\to x=3-2\cdot 1=1\)

   On the other hand: \(1<2\cdot 1\)

   \(\to x,y \in (\varnothing; \varnothing)\)

   Trả lời