540км=54000000см
54000000÷5000000=10,8 см
на карте будет 10,8 см
Ответ такой выбери удобный тебе способ
<span><span>−5x2+21x−18</span>2x2−3x</span>=<span>0
</span><span><span>−5x2+21x</span>−18</span>=<span>0
</span><span><span>(<span>−5x+6</span>)</span>(x−3)</span>=<span>0
</span><span><span><span>−5x</span>+6</span>=<span><span><span>0 or </span>x</span>−3</span></span>=<span>0
</span><span>x=<span><span><span>65</span><span> or </span></span>x</span></span>=<span>3</span>