Question

Решите задачи 7 класса

Answer 1

$5.;frac{3^6cdot27}{81}=frac{3^6cdot3^3}{3^4}=frac{3^9}{3^4}=3^5=243\\6.;3frac37x^5y^6cdotleft(-2frac13x^5yright)^2=frac{24}7x^5y^6cdotleft(-frac73x^5yright)^2=frac{24}7x^5y^6cdotfrac{49}9x^{10}y^2=\=frac{56}3x^{15}{y^8}=18frac23x^{10}y^8\\(a^{n+1})^2:a^{2n}=a^{2n+2}:a^{2n}=a^{2n+2-2n}=a^2$