A= { -3; -2; -1; 0; 1; 2 }

M = 5 + 5³ + 5⁵ + ... + 5⁹⁹

5²M = 5³ + 5⁵ + 5⁷ + ... + 5¹⁰¹

25M - M = ( 5³ + 5⁵ + 5⁷ + ... + 5¹⁰¹ ) - ( 5 + 5³ + 5⁵ + ... + 5⁹⁹ 

)

24M = 5¹⁰¹ - 5

M = \(\dfrac{5^{101}-5}{24}\)

( - 17 ) . 45 . 0 . ( - 2 )

= ( -17 ) . 0 . ( - 2 )

= 0 . ( - 2 )

=0

0,33 + 0,38 + 0,67 + 12%

= 0,33 + 0,38 + 0,67 + 0,12

= ( 0,33 + 0,67 ) + ( 0,38 + 0,12 )

= 1 + 0,5

= 1,5

( 75 x 5⁴ + 175 x 5⁴ ) : ( 20 x 25 x 125 - 625 x 75 )

= [ 5⁴ x ( 75 + 175 ) ] : ( 100 x 625 - 625 x 75 )

= ( 5⁴ x 250 ) : ( 5⁴ x 25 )

= 250 : 25

= 10

3/2 = 60/40

4/5 = 32/40

( x + 26 ) - 18 = 12

x + 26 = 12 + 18

x + 26 = 30

x = 30 - 26

x = 4

25 - (-17) +24 -12

= 25 + 17 + 24 - 12

= 42 + 24 -12

= 66 - 12

= 54

A = 1-2+2^2 - 2^3 +...+ 2^50

2A = 2 - 2^2 + 2^3 - 2^4 +...+ 2^51

2A + A = ( 2 - 2^2 + 2^3 - 2^4 +...+ 2^51 )+(1-2+2^2 - 2^3 +...+ 2^50 )

3A = 2^51 + 1

A = 2⁵¹ + 1/3

17,2 : 4 x 9,5 + 89,72 = 4,3 x 9,5 + 89,72

                                   = 40,85 + 89,72

                                   = 130,57