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Poziom A
a) 3 x + 7 +2.x = 22
b) 8x-5-4.r = 15
c) - 9 + 7 x = 55
d) 2.3+3+5.1 = 17
e) 5.1 +21 - 9. r = 5
1) 6-1-23 - r = 7
g) 4.8-19 +2.r = 23
b) 7-1 + 6-5.x = 24
i) 9.1 + 12 -3.1 = 18
pomoże ktoś prosze ​



Odpowiedź :

Odpowiedź:

a. 3x + 7 = 2x = 22

5x + 7 =22

5x = 22 - 7

5x = 15

x = 3

b. 8x - 5 - 4r = 15

8x = 15 + 5 + 4r

8x = 20 +4r

x = [tex]\frac{5}{2}+\frac{1}{2}r, reR[/tex]

c. -9 + 7x = 55

7x = 55+9

7x = 64

x = [tex]\frac{64}{7}[/tex] = 9 [tex]\frac{1}{7}[/tex]

d. ?

e. 5,1 + 21 - 9r = 7

26, 1 - 9r = 7

-9r = 7 - 26, 1

-9r  = -19,1

r = [tex]\frac{191}{90}[/tex]

1. 6 - 1 - 23 - r = 7

-18 - r = 7

-r = 7 + 18

-r = 25

g. 4,8 - 19 + 2r = 23

-14 , 2 + 2r = 23

2r = 23 + 14,2

2r = 37,2

r = 18,6  

b. 7 - 1 + 6 - 5x = 24

12 - 5x = 24

-5x = 24 - 12

-5x = 12

x = - [tex]\frac{12}{5}[/tex]

i. jest okej