Question

A) 79-(79-2021)

b) 4mũ 5 : 4mũ 3 - 8

c) 17.(-85)+17.85

Answer 1

\(a,79-\left(79-2021\right)=79-79+2021=2021\\ b,4^5:4^3-8=4^2-8=16-8=8\\ c,17.\left(-85\right)+17.85=\left(-17\right).85+17.85=85\left(17-17\right)=85.0=0\)

Answer 2

a) 79 - (79 - 2021) = 79 - 79 + 2021 = 2021

b) 4⁵ : 4³ - 8 = 4² - 8 = 16 - 8 = 8

c) 17 . (- 85) + 17 . 85 = 17 . (- 85 + 85) = 17 . 0 =0