1. 3x + 7 = -2x 5 x = -2.
2. .
. 7x + 4 = 18 . (3 +5) 2 1 = 6( 1 ) + 15 . 4(4 + 2) = 10 +20
3. . a .
i. 7x + 4 = 40 5x ii. 7( 3x 4 ) + 5 = 10( x + 1)
4.
3 15 2 10
x x x = 4
5. .
3 + 1 = 7 0
2(+1) = 2 2 4 + 7 + 1 = 3 + 5 + 4
2011 + 1 = 1 2
6. ) 4 + 1 < 2 + 7 ) 2( 2 ) > 5 20
7.
5 1 < 9 3 + 4 < 5 + 6
1 4
8. . 9. () ()
) = ) + = + ) ( )2 =
10. , .
11. .
12.
. ) y = 2x B) y = - 5x ) y = ()x
13.
14. .
2 4
15. .
5 m
12 m 8 cm
17 cm
16. 10cm
8 cm , .
8 cm
10 cm
17. ) ) )
18.
5 3
1 4 3
3 4
19.
30 45 60
20.
.
21.
140
100
22. .
23.
, : A) = 7cm B) = 40 m
24.
15,7 cm.
25. 314 mm2.
2 cm 26. .
4 4