Question

Помогите 7 класс 2 вариант

Answer 1

Ответ:

1)a)$6^{2}-3*2^2=36-3*4=36-12=24$

b)$81*(\frac{1}{3})^4-0.05*(-10)^2=\frac{81}{81} -0.05*100=1-5=-4$

c)$(\frac{8}{9})^0-8^{2}*\frac{1}{72}+(-2\frac{1}{3})^2=1-\frac{64}{72}+\frac{49}{9}=1-\frac{8}{9}+5\frac{4}{9}=\frac{1}{9}+5\frac{4}{9}=5\frac{5}{9}$

2

a)$c^{18}:c^{15}*c^2=c^{18-15+2}=c^5$; $(a^2)^5:a=a^{10}:a=a^{10-1}=a^9$ $49y^{2}=7^2y^2=(7y)^2$

b)$(c^5)^3*c^4=c^{15}*c^4=c^{19}$; $\frac{x^2*x}{x^3}=\frac{x^3}{x^3}=x^0=1$; $(((-a)^2)^3)4=(a^6)^4=a^{24}$

c)$(y^{n-4})^5 *((-y^4)^2)^3=y^{5n-20}*y^{24}=y^{5n-20+24}=y^{5n+4}$