1\26: 1\2=1,05
1,05-1,5= - 0, 45
- 1 1\9: 3\20= - 1 1\9
- 9\20:(-1 1\9)=1\2
Ответ: 1\2 или 0,5
Решение задания на картинке.
X²+3x=4
x²+3x-4=0
D=3²-4*(-4)*1=9+16=25=5²
![x_{1}= \frac{-3- \sqrt{25} }{2*1} = \frac{-3-5}{2} = \frac{-8}{2} =-4 \\ x_{2}= \frac{-3+ \sqrt{25} }{2*1} = \frac{-3+5}{2} = \frac{2}{2} =1 \\](https://tex.z-dn.net/?f=x_%7B1%7D%3D+%5Cfrac%7B-3-+%5Csqrt%7B25%7D+%7D%7B2%2A1%7D+%3D+%5Cfrac%7B-3-5%7D%7B2%7D+%3D+%5Cfrac%7B-8%7D%7B2%7D+%3D-4+%5C%5C+x_%7B2%7D%3D+%5Cfrac%7B-3%2B+%5Csqrt%7B25%7D+%7D%7B2%2A1%7D+%3D+%5Cfrac%7B-3%2B5%7D%7B2%7D+%3D+%5Cfrac%7B2%7D%7B2%7D+%3D1+%5C%5C+)
Ответ: х₁=-4,х₂=1
a³-(a+1)³+3a²=a³-(a³+3a²+3a+1)+3a²=a³-a³-3a²-3a-1+3a²=-3a-1= -(3a+1)
2x² - 3x + 4ax - 6a = x(2x - 3) + 2a(2x - 3) = (2x - 3)(x + 2a).
<span> (y-x)^2-8(x-y)=(y-x)^2+8(y-x)=(y-x)*((y-x)+8)=(y-x)*(y-x+8)</span>