Question

Calcule:
A) -5² + 1 - 74
B) (-8)² - 2 - 1 (-1)
C) ( 1 - 2,5 )²
D) 3² + 3-²

Answer 1

$A) -5^2+1-74=-25+1-74=-99+1=-98 \\ \\ \\ B)(-8)^2-2-1(-1)=64-2+1=65-2=63 \\ \\ \\ C)(1-2,5)^2=(-1,5)^2=2,25 \\ \\ \\ 3^2+ 3^{-2} =9+ \frac{1}{3^2} =9+ \frac{1}{9} = \frac{9.9+1}{9} = \frac{81+1}{9} = \frac{82}{9}$