Question

Proszę o szybkie rozwiązaniea) 2x-3/5 = 21/25
b)7,5/5 = 3/4y +1
c)x+2/3 = 4/5

Answer 1

7,5/5=3/4y+1

 

7,5(4y+1)=15

 

30y+7,5=15

 

30y=15-7,5

 

30y=7,5      /:30

 

y=1/4

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c)   x+2/3=4/5

 

5(x+2)=12

 

5x+10=12   

 

5x=12-10

 

5x=2     /:5

 

x=2/5

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a)2x-3/5=21/25

 

25(2x-3)=105

 

50x-75=105

 

50x=105-75

 

50x=30     /:50

 

x=3/5

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Answer 2

a) 2x-3/5 = 21/25

2x = 21/25 + 15/25

2x = 36/25

x = 18/25

b)7,5/5 = 3/4y +1

1,5 = 3/4y + 1

3/4y = 1/2

y = 2/3

c)x+2/3 = 4/5

x = 12/15 - 10/15

x = 2/15