Question

Rozwiąż :
6 + 12 ÷ 1/8 (jedna ósma) + 7/8 (siedem ósmych) ·6,4 = ?
Oblicz :
3 x (1 1/2 )² - 2 × (0,5)3 =?
(5 1/4 - 5,05) ² - 1/25 = ?
2,5 × 4 1/2 - 5 17/20 ÷ 0,9 = ?
( 5/6+ 1/3) ÷ (2 2/3 - 1,75 ) = ?
Te np. 1/2 to są ułamki zwykłe w jednym jest '' (0,5)3 ← to te 3 to jest coś podobnego do ² tylko nie mogłam napisać
Oblicz : 2 1/3 × a = 0,7
(17 5/6 - 15,75 ) + b = 3,5
2,7 ÷ y = 1 3/4 - 0,85
2,125 - p = 1 5/6
Ile ma
a-
b-
y-
p-
Przy tych obliczeniach chcę by było po kolei napisane co najpierw itp a nie sam wynik :)
DAM NAJJ !!! PROSZĘ NA JUTRO !

Answer 1

6 + 12 ÷ 1/8 + 7/8  * 6,4

= 6 + 12/1 * 8/1 + 7/8 * 64/10 =

= 6 + 96/1 + 7/1 * 8/10 =

= 6 + 96 + 56/10 =

= 102 + 5,6 = 107,6

  
 
3 x (1 1/2 )² - 2 × (0,5)^3 =

= 3 * (3/2)^2 - 2* (5/10)^3 =

= 3 * 9/4 - 2 * 125/1000 =

= 27/4 - 2* 1/8 =

= 27/4 - 2/8 =

= 27/4 - 1/4 =

= 26/4 = 12 2/4 = 12 1/2

 

(5 1/4 - 5,05) ² - 1/25 = 

= (5 25/100 - 5 5/100)^2 - 1/25 =

= (20/100)^2 - 1/25 =

= (2/10) ^2 - 1/25 =

= 4/100 - 4/100 = 0

 2,5 × 4 1/2 - 5 17/20 ÷ 0,9 = 

= 25/10 * 9/2 - 117/20 : 9/10 =

= 225/20 - 117/20 * 10/9 =

= 225/20 - 13/20 * 10/1 =

= 225/20 - 130/20 =

= 95/20 = 4 15/20 = 4 3/4

 ( 5/6+ 1/3) ÷ (2 2/3 - 1,75 ) = 

= (5/6 + 2/6) : (8/3 - 1 3/4) =

= 7/6 : (8/3 - 7/4) =

= 7/6 : (32/12 - 21/12) =

= 7/6 : 11/12 =

= 7/6 * 12/11 =

= 7/1 * 1/11 =

= 7/11

 2 1/3 × a = 0,7

a = 0,7 : 2 1/3 = 7/10 : 7/3 = 7/10 * 3/7 = 1/10 * 3/1 = 3/10

a = 3/10

 (17 5/6 - 15,75 ) + b = 3,5

b = 3,5 - (17 5/6 - 15.75) = 3,5 - (107/6 - 15 3/4) = 3,5 - (214/12 - 15 9/12) =

= 3,5 - (214/12 - 189/12) = 3,5 - 35/12 = 35/10 - 35/12 =

= 210/60 - 175/60 = 35/60 = 7/12

b = 7/12

 2,7 ÷ y = 1 3/4 - 0,85

2,7 = (1 3/4 - 0,85) * y

y = 2,7 : (1 3/4 - 0,85) = 2,7 : (7/4 - 85/100) = 2,7 : (175/100 - 85/100) =

= 2,7 : 90/100 = 27/10 : 9/10 = 27/10 * 10/9 = 27/1 * 1/9 = 27/9 = 3

y = 3

 2,125 - p = 1 5/6

2,125 = 1 5/6 + p

p = 2,125 - 1 5/6 = 2 125/1000 - 1 5/6 = 2 1/8 - 1 5/6 = 2 6/48 - 1 40/48 =

= 1 54/48 - 1 40/48 = 24/48 = 1/2

p = 1/2