Решите пропорции 2х/3 = 4/9 3х/5 = 9/10 8/15 = 6х/9 12/13 = 18х/39 Ответы я знаю, а примеры я взял из учебника. Просто хочу узна

2376-қазақстан

правилно

<span>d+1/5=4/7+3/7</span>

<span>д+1/5=7/7</span>

<span>д=1-1/5</span>

<span>д=4/5</span>

<span>
</span>

<span><span>f+4/5=4/7+3/7</span></span>

<span><span>f+4/5=7/7</span></span>

<span><span>f=1-4/5</span></span>

<span><span>f=1/5</span></span>

<span><span>
</span></span>

<span><span><span>b+2/5=4/7+3/7</span></span></span>

<span><span><span>b+2/5=7/7</span></span></span>

<span><span><span>b=1-2/5</span></span></span>

<span><span><span>b=3/5</span></span></span>