Toán nè

S

son9701

Chém đẹp + 3 chấm luôn :

[TEX]2x+3y \vdots 17 \Rightarrow 4(2x+3y)\vdots 17 \Leftrightarrow 8x+12y \vdots 17[/TEX]

Mà [TEX]17x+17y \vdots 17[/TEX]

[TEX]\Rightarrow (17x+17y)-(8x+12y) \vdots 17 \Leftrightarrow 9x+5y \vdots 17[/TEX]

ĐPCM
 
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