Объяснение:
5.11 . 1 ) ( 2x⁵y⁷)³ : (x¹⁴y²⁰) - (3xy⁵)³ :( x²y¹⁴) = ( 8x¹⁵y²¹)/(x¹⁴y²⁰) -(27x³y¹⁵)/(x²y¹⁴)=
= 8xy - 27xy = - 19xy ;
2 ) ( -3a⁴b⁵)² * ( - 2a²b³)³ : 9 - 72a⁶b⁹)² + a²b = 9a⁸b¹⁰ * 8a⁶b⁹ : (72²a¹²b¹⁸) +
+ a²b = ( 72a¹⁴b¹⁹)/( 72²a¹²b¹⁸) + a²b =1/72 a²b + a²b = 1 1/72 a²b ;
