Question

Zad 3 str 16

Oblicz sprytnie. ^ - to potega

a) 27 x 3^9 : 3^10.

b) 125 x 5^7 : 5^9.

c) 64 x 2^9 : 2^10.

z obliczeniami

Answer 1

a) 27 x 3^9 : 3^10= 27 x 3^-1= 27x 1/3 = 9

b) 125 x 5^7 : 5^9= 125 x 5^-2 = 125 x 1/25 = 5

c) 64 x 2^9 : 2^10 = 64 x 2^-1 = 64 x 1/2 = 32

 

Answer 2

27x3^9/3^10=3^3x3^9/3^10=3^12/3^10=3^2=9

 

125x5^7/5^9=5^3x5^7/5^9=5^10.5^9=5

 

64x2^9/2^10=2^6x2^9/2^10=2^15/2^10=2^5=32