1/3√900y-√121y=1/3×30√y-11√y=10√y-11√y=-√y
Да все верно <span>х - 100%
25,2 - (100-16%)= 84
х/25,2=100/84
84х=2520
х=30</span>
1 - x^{2} = 0
- x^{2} = -1
х = 1
При х = 1 и х = -1
<span>1)
0,01a</span>⁴ <span>+ b</span>²<span>- 0,2a</span>²<span>b = (0,1a</span>²<span>)</span>² - 2·0,1a²·b + b² = (0,1a² - b)²<span>
2)
</span>¹<span>/</span>₄ <span>a</span>² <span>+ 3a + 9 = (</span>¹/₂ a)² + 2·¹/₂ a·3 + 3² = (¹/₂ a + 3)²<span>
3)
</span>¹<span>/</span>₁₆ <span>c</span>⁴ <span>+ 2c</span>²<span>x+16x</span>² = (¹/₄ c²)² + 2·¹/₄ c²·4x + (4x)² = (¹/₄ c² + 4x)²<span>
4)
b</span>⁸ <span>- a</span>²<span>b</span>⁴ <span>+ </span>¹<span>/</span>₄ <span>a</span>⁴ = (b⁴)² - 2·b⁴ · ¹/₂ a² + (¹/₂ a²)² = (b⁴ - ¹/₂ a²)²