Question

Prosze zrobić mi zadanie 2 ze strony 141 (książka "Matematyka wokół nas")
a) -już to mam
b) -2,8 + (11 ¼)
c)√⁴/₉ · √2¼
d) 5·3 ⅕ - 0,5² - √⁹/₁₆
e)∛⅛ + (-2)⁴ -⅛

f) -(-7)² +√49
g) -4² :2³ + ⅓∛27
h) [-2·(-3,3)] : (-2⅕) + 7¼

Answer 1

b) -2(4/5) + 11 (1/4)= -2 (16/20) +11 (5/20)= 11 (5/20) - 2 (16/20) = 8 ((9/20)

c) 2/3 * 3/2 =1

d) 5 *16/3 - 1/4 - 3/4 = 30 - 1= 29

e) 1/2 + 16 - 1/8 = 16 1/2 - 1/8 = 16 4/8 - 1/8 = 16 3/8

f) - 49 + 7 = - 42

g) - 16 : 8 + 1/3 *3 = -2 +1= -1

h) 6,6 : (-2,2) + 7,25= -3 + 7,25= 4,25

Answer 2

b) -2,8 + (11 ¼) =

= -2,8 - 11,25 =

= - (11,25 + 2,8) =

= - 14,05

 

c) √⁴/₉  · √2¼ =

= 2/3 · √9/4 =

= 2/3 · 3/2 = 1

 

d) 5·3 ⅕ - 0,5² - √⁹/₁₆ =

= 16 - 0,25 - 3/4 = 15

 

e)∛⅛ + (-2)⁴ -⅛ =

= 1/2 - 16 - 1/8 = -15,625

 

f) -(-7)² +√49 =

= - 49 + 7 = - 42

 

g) -4² :2³ + ⅓∛27 =

= - 8 : 8 + 1/3 · 3 =

= -1 + 1 = 0

 

h) [-2·(-3,3)] : (-2⅕) + 7¼ =

= [6,6] : 5 1/20 =

= 6,6 : 0,05 = 132