Число 57, т.к. 5+7 = 12, 5*7 = 35
остальные комбинации (13 и 25, 15 и 23) не подходят, т.к. не являются суммой и произведением одних и тех же цифр
Периметр
Р=АВ+ВС+АС
2ц2/5+2,2+2ц1/2=
2ц2/5 + 2ц2/10 + 2ц1/2=
12/5 + 22/10 + 5/2 приведем к общему знаменателю 10
24/10 + 22/10 + 25/10=
(24+22+25)/10=71/10=7ц1/10
или
12/5 + 22/10 + 5/2 приведем к общему знаменателю 10
24/10 + 22/10 + 25/10=
<span>2,4+2,2+2,5=7,1</span>
Р1=Р2
у квадрата все стороны равны, периметр -это сумма всех сторон
значит 8+8+8+8 или 8*4=32см - это перимерт квадрата или прямоугольника Р=(а+в)*2
4+4=8 -это две ширины прямоугольника
32-8= 24см - две длины прямоугольника
24:2=12см - длина прямоугольника
1) 100-38=62% - росло клёнов.
2) 62-38=24% - на столько клёнов было больше, чем каштанов.
3) пропорция:
24% - 72 дерева
100% - х
х = 72•100/24 = 300 деревьев росли на аллее.
<span><span><span>6 × 1 = 6</span><span>6 × 2 = 12</span><span>6 × 3 = 18</span><span>6 × 4 = 24</span><span>6 × 5 = 30</span><span>6 × 6 = 36</span><span>6 × 7 = 42</span><span>6 × 8 = 48</span><span>6 × 9 = 54</span><span>6 × 10 = 60</span></span><span><span>7 × 1 = 7</span><span>7 × 2 = 14</span><span>7 × 3 = 21</span><span>7 × 4 = 28</span><span>7 × 5 = 35</span><span>7 × 6 = 42</span><span>7 × 7 = 49</span><span>7 × 8 = 56</span><span>7 × 9 = 63</span><span>7 × 10 = 70</span></span><span><span>8 × 1 = 8</span><span>8 × 2 = 16</span><span>8 × 3 = 24</span><span>8 × 4 = 32</span><span>8 × 5 = 40</span><span>8 × 6 = 48</span><span>8 × 7 = 56</span><span>8 × 8 = 64</span><span>8 × 9 = 72</span><span>8 × 10 = 80</span></span><span><span>9 × 1 = 9</span><span>9 × 2 = 18</span><span>9 × 3 = 27</span><span>9 × 4 = 36</span><span>9 × 5 = 45</span><span>9 × 6 = 54</span><span>9 × 7 = 63</span><span>9 × 8 = 72</span><span>9 × 9 = 81</span><span>9 × 10 = 90</span></span><span><span>10 × 1 = 10</span><span>10 × 2 = 20</span><span>10 × 3 = 30</span><span>10 × 4 = 40</span><span>10 × 5 = 50</span><span>10 × 6 = 60</span><span>10 × 7 = 70</span><span>10 × 8 = 80</span><span>10 × 9 = 90</span><span>10 × 10 = 100</span></span></span><span><span><span>1 × 1 = 1</span><span>1 × 2 = 2</span><span>1 × 3 = 3</span><span>1 × 4 = 4</span><span>1 × 5 = 5</span><span>1 × 6 = 6</span><span>1 × 7 = 7</span><span>1 × 8 = 8</span><span>1 × 9 = 9</span><span>1 × 10 = 10</span></span><span><span>2 × 1 = 2</span><span>2 × 2 = 4</span><span>2 × 3 = 6</span><span>2 × 4 = 8</span><span>2 × 5 = 10</span><span>2 × 6 = 12</span><span>2 × 7 = 14</span><span>2 × 8 = 16</span><span>2 × 9 = 18</span><span>2 × 10 = 20</span></span><span><span>3 × 1 = 3</span><span>3 × 2 = 6</span><span>3 × 3 = 9</span><span>3 × 4 = 12</span><span>3 × 5 = 15</span><span>3 × 6 = 18</span><span>3 × 7 = 21</span><span>3 × 8 = 24</span><span>3 × 9 = 27</span><span>3 × 10 = 30</span></span><span><span>4 × 1 = 4</span><span>4 × 2 = 8</span><span>4 × 3 = 12</span><span>4 × 4 = 16</span><span>4 × 5 = 20</span><span>4 × 6 = 24</span><span>4 × 7 = 28</span><span>4 × 8 = 32</span><span>4 × 9 = 36</span><span>4 × 10 = 40</span></span><span><span>5 × 1 = 5</span><span>5 × 2 = 10</span><span>5 × 3 = 15</span><span>5 × 4 = 20</span><span>5 × 5 = 25</span><span>5 × 6 = 30</span><span>5 × 7 = 35</span><span>5 × 8 = 40</span><span>5 × 9 = 45</span><span>5 × 10 = <span>50
</span></span></span></span><span><span><span>11 × 1 = 11</span><span>11 × 2 = 22</span><span>11 × 3 = 33</span><span>11 × 4 = 44</span><span>11 × 5 = 55</span><span>11 × 6 = 66</span><span>11 × 7 = 77</span><span>11 × 8 = 88</span><span>11 × 9 = 99</span><span>11 × 10 = 110</span></span><span><span>12 × 1 = 12</span><span>12 × 2 = 24</span><span>12 × 3 = 36</span><span>12 × 4 = 48</span><span>12 × 5 = 60</span><span>12 × 6 = 72</span><span>12 × 7 = 84</span><span>12 × 8 = 96</span><span>12 × 9 = 108</span><span>12 × 10 = <span>120</span></span></span></span>