Объяснение:
i²=-1 ; 1/i=i/i²=-i ; i⁸=(i²)⁴=(-1)⁴=1
1) (5i¹¹+7²⁰)/2i⁹=(5i¹¹/2i⁹) +(7²⁰/2i⁹)=(5i¹¹⁻⁹/2) +(7²⁰)/2i⁸⁺¹=2,5i² +(7²⁰)/2i⁸i=
=2,5*(-1) +(7²⁰/2*1i)=-2,5+(7²⁰/2)(1/i)=-2,5-(7²⁰/2)i
2) (6+4i)²=36+2*6*4i+16i²=36+48i-16=52+48i
Объяснение:
i²=-1 ; 1/i=i/i²=-i ; i⁸=(i²)⁴=(-1)⁴=1
1) (5i¹¹+7²⁰)/2i⁹=(5i¹¹/2i⁹) +(7²⁰/2i⁹)=(5i¹¹⁻⁹/2) +(7²⁰)/2i⁸⁺¹=2,5i² +(7²⁰)/2i⁸i=
=2,5*(-1) +(7²⁰/2*1i)=-2,5+(7²⁰/2)(1/i)=-2,5-(7²⁰/2)i
2) (6+4i)²=36+2*6*4i+16i²=36+48i-16=52+48i