Question

calculați
a)2019+2020*2019-2021*2018 b)2²⁰²¹-2²⁰²⁰-2²⁰¹⁹-2²⁰¹⁸
c) |(-2)²⁰²⁰+(-2)²⁰¹⁹|:(-2)²⁰¹⁸
| = modul
plss rapidd​

Answer 1

Răspuns:

a) = 2022

b) = -8072

c) = 4070,302

Answer 2

$\it a)\ = 2019\cdot(1+2020)-2021\cdot2018=2019\cdot2021-2021\cdot2018=\\ \\ =2021\cdot(2019-2018)=2021\\ \\ b)\ =2^{2018}\cdot(2^3-2^2-2-1)=2^{2018}\cdot1=2^{2018}\\ \\ c)\ =|\underbrace{2^{2020}-2^{2019}}_{ > 0}|:2^{2018}=(2^{2020}-2^{2019}):2^{2018}=\\ \\ =2^{2019}\cdot(2-1):2^{2018}=2^{2019}:2^{2018}=2^{2019-2018}=2$