חידון לכיתה ז

(Blank)

20

2+5-10

-3

50

4(12-15)

-12

100

2x+4x-20

6x-20

150

4x=20

x=5

(Blank)

20

10-12=

-2

50

6(20-30)

-60

100

47-3x-7x-20

27-10x

150

20-x=15

x=5

(Blank)

20

20-13-14

-7

50

-3(10-12)

6

100

3x+6x-10x

-x

150

x-13=24

x=37

(Blank)

20

3-10+4

-3

50

6(50-45)

30

100

43+12x-20x-50

-7-8x

150

-4x=12

x=-3

(Blank)

20

40-20-30

-10

50

(30-27)5

15

100

34-7x-40

-6-7x

150

12x=-36

x=-3