Номер 40.2 выполните умножение с 2 по 6 пример

2)

[tex] \frac{5a}{8y} \times \frac{7}{10} = \frac{35a}{80y} = \frac{7a}{16y} .[/tex]

3)

[tex] \frac{ {b}^{2} }{10} \times \frac{5}{b} = \frac{ {5b}^{2} }{10b} = \frac{b}{2} .[/tex]

4)

[tex] \frac{12 {x}^{5} }{25} \times \frac{15}{8 {x}^{2} } = \frac{180 {x}^{5} }{200 {x}^{2} } = \frac{9 {x}^{3} }{10} .[/tex]

5)

[tex] \frac{5}{3a} \times \frac{2b}{3} = \frac{10b}{9a} = 1 \frac{1}{9} ab.[/tex]

6)

[tex] \frac{3x}{4} \times \frac{1}{x} = \frac{3x}{4x} = \frac{3}{4} .[/tex]

25х^2-(x-4)^2=0

25х^2-(х^2-8х+16)=0

25х^2-х^2+8х-16=0

24х^2+8х-16=0

д=64+1536=1600

х1=(-8+40)/48=2/3

х2=(-8-40)/48=-1

(sqrt(5)-2*sqrt(3))^2+sqrt(240) = 5-4sqrt(15)+12+sqrt(240)=17- sqrt(240)+sqrt(240)=17