Question

Помогите пожалуйста! 7 класс
Даю 20 баллов

Answer 1

Ответ:

$4.\\1)(abc)^7=a^7b^7c^7\\\\2)(4y)^3 = 4^3y^3=64y^3\\\\3)(-3mn)^3 = -(3mn)^3=-3^3m^3n^3=-27m^3n^3$

$5.\\1)-a^5=-(a^5)=-(a)^5=(-a)^5\\\\2)81a^4b^4=3^4a^4b^4=(3ab)^4\\\\3)-\frac{8}{125}a^3b^3 = -(\frac{8}{125}a^3b^3) = -(\frac{2^3}{5^3}a^3b^3) = -((\frac{2}{5})^3a^3b^3) = -(\frac{2}{5}ab)^3=(-\frac{2}{5}ab)^3$

$6.\\1)(-m^3)^6=(m^3)^6=m^{3\cdot6} = m^{18}\\\\2)((m^5)^2)^4=(m^{5\cdot2})^4=(m^{10})^4=m^{10\cdot4}=m^{40}\\\\3)(-m^4)^9\cdot(-m^3)^7:m^{21} = (-m^{4\cdot9})\cdot(-m^{3\cdot7}):m^{21} = -(m^{36})\cdot(-(m^{21})):m^{21}= \\\\=m^{36}\cdot m^{21}:m^{21} = m^{36}\cdot m^{21-21} = m^{36} \cdot m^0 = m^{36+0} = m^{36}$