Question

zad9 str 177 matematyka 1 klasa gimnazjum ! b) 1-6/7x=4/7 d) x/6 - 1/6 =1 f) 2/5 (3-x) = -2

Answer 1

b)

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d)

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f)

Answer 2

b)

1-6/7x=4/7        /*7

7-6x=4

-6x = 4-7

-6x = -3     /:(-6

x = 1/2

 

d)  

x/6 - 1/6 =1      /*6

x - 1 = 6

x = 6+1

x = 7

 

f)

2/5 (3-x) = -2    /*5

2(3-x) = -10   

6-2x=-10

-2x = -10-6

-2x = -16    /(-2

x = 8