186^3 - 34^3 6395552 ------------------ +186 *34= -------------- + 186*34= 42076 +6324=48400
152 152
1) ![\(\frac{9}{11}-\frac{9}{22}\cdot 4\frac{4}{9}=\frac{9}{11}-\frac{9}{22}\cdot \frac{40}{9}=\frac{9}{11}-\frac{9\cdot 40}{22\cdot 9}=\frac{9}{11}-\frac{20}{11}=-\frac{11}{11}=-1\)](https://tex.z-dn.net/?f=%5C%28%5Cfrac%7B9%7D%7B11%7D-%5Cfrac%7B9%7D%7B22%7D%5Ccdot%204%5Cfrac%7B4%7D%7B9%7D%3D%5Cfrac%7B9%7D%7B11%7D-%5Cfrac%7B9%7D%7B22%7D%5Ccdot%20%5Cfrac%7B40%7D%7B9%7D%3D%5Cfrac%7B9%7D%7B11%7D-%5Cfrac%7B9%5Ccdot%2040%7D%7B22%5Ccdot%209%7D%3D%5Cfrac%7B9%7D%7B11%7D-%5Cfrac%7B20%7D%7B11%7D%3D-%5Cfrac%7B11%7D%7B11%7D%3D-1%5C%29)
2) ![\(\frac{4,7+3,54}{0,8}=\frac{8,24}{0,8}=10,3\)](https://tex.z-dn.net/?f=%5C%28%5Cfrac%7B4%2C7%2B3%2C54%7D%7B0%2C8%7D%3D%5Cfrac%7B8%2C24%7D%7B0%2C8%7D%3D10%2C3%5C%29)
3) 60 - 12 = 48 (Вт)
4) 50 * 1,609 = 80,45 (км/ч) скорость автомобиля
5) 120 : 250 · 100% = 48% книги прочитала Даша
100% - 48% = 52% книги осталось прочитать Даше
Второй способ:
250 - 120 = 130 (ст) Осталось прочитать Даше
130 : 250 · 100% = 52% книги осталось прочитать Даше
x² - 2xc + c² = (x - c)² = (x - c)(x - c)
<span>36</span>³ ·<span> 6</span>⁹ : <span>216</span>⁴ =
= (6²)³ · 6⁹ : (6³)⁴ =
= 6⁶ · 6⁹ : 6¹² =
=6⁶⁺⁹⁻¹² =
= 6³ = 216
Ответ: 216
Ах+5а=30+6х
7а+5а=30
30=7а-5а
30=2а
а=30:2
а=15