Question

1.Oblicz 65% liczby (9x4^-2 -2^-4)^-3

2. dane są liczby a=3,2x10^4 i b=4x10^-6.Oblicz axb, a/b, b/a, ab^2

Answer 1

1.Oblicz 65% liczby (9x4^-2 -2^-4)^-3

( 9  * ( 1/4)² - ( 1/2 ) ⁴ ) ⁻³=

9 * 1/16 - 1/16 ) ⁻³ =

9/16 - 1/16 ) ⁻³ =

8/16 ) ⁻³=

1/2 ) ⁻³ = 2³ = 8

 

65/100 * 8 = 130/25 = 26/5= 5 i 1/5

 

2. dane są liczby a=3,2x10^4 i b=4x10^-6.Oblicz axb, a/b, b/a, ab^2

 

a= 3,2 * 10 ⁴                      b= 4 * 10 ⁻⁶

a= 3,2 * 10 000                  b= 4 * ( 1/10) ⁶

a= 32 000                         b= 4 * 1/ 1 000 000

                                      b=  250 000

 

a*b= 32 000 * 250 000 = 8 000 000 000

a/b = 32 000 / 250 000 = 16/125

b/a = 250 000 / 32 000= 125/16 =  7 i 13/16