1)<span> 61/8</span>−<span>175/100</span>=<span>25 · 61/25 · 8</span>−<span>2 · 175/2 · 100</span>=<span>1525/200</span>−<span>350/200</span>=<span>1525 − 350/200</span>=<span>1175/200</span>=<span>47 · 25/8 · 25</span>=<span>47/8</span><span>
2) </span>5<span> 6/11</span>−<span>35/10</span>=<span>5 · 11 + 61/1</span>−<span>35/10</span>=<span>61/11</span>−<span>35/10</span>=<span>10 · 61/10 · 11</span>−<span>11 · 35/11 · 10</span>=<span>610/110</span>−<span>385/110</span>=<span>610 − 385/110</span>=<span>225/110</span>=<span>45 · 5/22 · 5</span>=<span>45/22</span><span>
3) </span><span>9−</span><span>22/10</span>=<span>9/1</span>−<span>22/10</span>=<span>10 · 9/10 · 1</span>−<span>1 · 22/1 · 10</span>=<span>90/10</span>−<span>22/10</span>=<span>90 − 22/10</span>=<span>68/10</span>=<span>34 · 2/5 · 2</span>=<span>34/5</span><span>
4) </span><span>34/5</span>×<span>45/22</span>=<span>34 · 45/5 · 22</span>=<span>1530/110</span>=<span>153 · 10/11 · 10</span>=<span>153/11</span><span>
5) </span><span>47/8</span>÷<span>153/11</span>=<span>47/8</span>·<span>11/153</span>=<span>47 · 11/8 · 153</span><span>= 517/1224
6) 517/1224</span>×<span>12/7</span>=<span>517 · 12/1224 · 7</span>=<span>6204/8568</span>=<span>517 · 12/714 · 12</span>=<span>517/714</span>
1) 4 * 2 = 8 (абр.)
2) 8 - 4 = 4 (шт.)
Ответ: на 4 персика меньше, чем абрикосов
253 -(х - 459) = 138
253 - х + 459 = 138
- х = 138 - 253 - 459
х = 574
502 -(217 - х) = 421
502 - 217 + х = 421
х = 421 - 502 + 217
х = 136
871 -(х + 157) = 385
871 - х - 157 = 385
- х = 385 - 871 + 157
- х = - 329
х = 329
(Знак-:это разделить
Знак-• это умножить)
1) Х:40=6 840,
Х=6 840•40,
Х= 273 600,
-----------------(проверка)
273 600:40=6 840
6 840=6 840
Ответ: 273 600
2). 728 100:Х=900
Х=728 100:900
Х=809.
------------(проверка)
728 100:809=900
900=900
Ответ:809
Не за что!
30 40 50 25 35 45 55 и +1за 50 и 2
в общем 8