Question

Rozwiąż równanie i sprawdź rozwiązanie!

a) 2 1/3*a = 0,7

b) (17 5/6 - 15,75) + b=3,5

c) 2,7 : y = 1 3/4 - 0,85

d) 2,125 - p = 1 5/6

Pomocy !!!

Answer 1

a) 2 1/3*a = 0,7

7/3a = 7/10 /*3

7a = 21/10 / :7

a = 21/10 * 1/7

a = 3/10

a = 0,3

Spr  2 1/3 * 3/10 = 7/3 * 3/10 = 7/10 = 0,7

 

b) (17 5/6 - 15,75) + b=3,5

(107/6 - 15 75/100) + b = 3,5

(107/6 - 15 3/4) + b = 3,5

(107/6 - 63/4 ) + b = 3,5

(214/12 - 189/12) + b = 3,5

25/12 + b = 35/10

b = 7/2 - 25/12

b = 42/12 - 25/12

b = 17/12

b = 1 5/12

Spr (17 5/6 - 15,75) + 1 5/12 =(107/6 - 15 3/4) + 17/12 = 214/12 - 189/12 + 17/12 = 25/12 + 17/12 = 42/12 = 3,5

 

c) 2,7 : y = 1 3/4 - 0,85

2,7 : y = 1,75 - 0,85

2,7 : y = 0,9 / * y

2,7 = 0,9y /: 0,9

y = 3

Spr 2,7 : 3 = 0,9

 

d) 2,125 - p = 1 5/6

-p = 11/6 - 2 125/100

-p = 11/6 - 2 5/4

-p = 11/6 - 13/4

-p = 22/12 - 39/12

-p = -17/12

p = 17/12

p = 1 5/12

2,125 - 17/12 = 2 5/4 - 17/12 = 13/4 - 17/12 = 39/12 - 17/12 = 22/12 = 11/6 = 1 5/6