1. Arvuta, kui a = 7
128 - 6 X
a
...........................................................
(a + 52) X 10
...........................................................
a + 96 -
38
...........................................................
a X (51 - 39)
..........................................................
2. Loe ülesanded, lisa puuduvad märgid.
14 7 = 21
3 13 = 39
11 11 = 1 |
42 = 2 21
28 = 56 2
19 = 1 19 |
6 + 2 = 2 4
3 X 2 = 9 3
2 X 9 = 3 6 |
3. Leia tähtede arvväärtused.
x - 14 = 58 x = .....
a X 9 = 36 a = .....
42 : b = 6 b = ..... 48 - x = 24 x = .....
18 : k = 3 k = .....
1 = 28 : s s = ..... |
 |
6 x 9 =
a
a = .....
3 + c =
102 c = .....
f X 7 =
56 f = ..... 7 X 0 + 6 = m + 1 m = .....
0 : 4 + 18 = 2 X n n = .....
564 - j = 561 - 1 j =
..... |
4. Millised võrdused on tõesed, kui a = 7, b = 9, c = 15 ja d = 63 ?
| a = a + c b + a = c
d : a = b
a + a = c |
a = c - b a = c - a
2 X b = c
d : b = c |
b : 3 = b - a c : 5 = b : 3
2 X a = b + a
2 X a = d - 49 |
|