Matematik 27/9

De fire regnearter

100

278 + 459

= 737

200

1587 - 985

= 602

300

54/9

= 6 

400

137 * 83

= 11.371 

500

800 - 100 + 30 * 2

= 760 

Reduktion

100

5x - (2x + 3)

= 3x - 3

200

14a - (3a + 4)

= 11a - 4

300

7a + 9b) - 5a - (7b - 4a)

= 6a + 2b

400

(x + 1) + (2x + 8) + (7x + 11)

= 10x + 20

500

(2x - (5x + 2y) + (3x - y)) + (17y + 10x)

= 10x + 14y

Tabeller

100

_ _ _ 12 _ 18 21 _ 27 _ 

3 6 9 12 15 18 21 24 27 30 

200

_ 8 _ 16 20 24 _ _ 36 _ 

4 8 12 16 20 24 28 32 36 40 

300

_ 12 18 _ 30 _ _ 48 54 _

6 12 18 24 30 36 42 48 54 60 

400

_ _ _ 32 40 48 _ 64 _ _ 

8 16 24 32 40 48 56 64 72 80

500

_ 18 _ 36 _ _ 63 72 _ _ 

9 18 27 36 45 54 63 72 81 90

Ligninger

100

x + 13 = 20

x = 7 

200

x + 19 = 25

x = 6

300

2x + 2 = 10

x = 4 

400

4x + 1 = 33

x = 8

500

4x - 8 + 2x = 2x + 4

x = 3