Б) (87+35)*18=2196.........
<span>Достраиваем до прямоугольного треугольника. По у=2, по х=8. у/х=-0,25.</span>
17*17=288.Поэтому ответ :17
<span>х+3*25=87</span>
<span>х+75=87</span>
<span>х=87-75</span>
<span>х=12</span>
<span>8*17-x=107</span>
<span>136-х=107</span>
<span>136-107=х</span>
<span>х=29</span>
<span> 555:5-х=74</span>
<span>111-х=74</span>
<span>111-74=х</span>
<span>х=37</span>
<span>2х+87=93</span>
<span>2х=93-87</span>
<span>2х=6</span>
<span>х=6:2</span>
<span>х=3</span>
<span>3*(35-х)=63</span>
<span>35-х=63:3</span>
<span>35-х=21</span>
<span>35-21=х</span>
<span>х=14</span>
<span>(120-х):13=8</span>
<span>120-х=8*13</span>
<span>120-х=104</span>
<span>120-104=х</span>
<span>х=16</span>