: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 6, 7, 4*.
4*. 28 - 4 = 24 () .
.
 |
: 18 .
7. (7 6): 3 = 14 (2) .
6. :
= 100; 100 + 2000 = 2100; 2100 < 10 000? ;
2100 + 2000 = 4100; 4100 < 10 000? ;
4100 + 2000 = 6100; 6100 < 10 000? ;
6100 + 2000 = 8100; 8100 < 10 000? ;
8100 + 2000 = 10 100; 10 100 < 10 000? ;
b = 10 100 . .
5.
() 1, 2, 3, 5.
1. 92: 0 2 , , . . 1 ( , 1). 10 .: 1 ., 9 . ; 10 : 1 , 9 . . . :
10 . - 2 . = 8 ., 9 . - 9 . = 0 . . .
2.
 |
1) 50 + 40 = 90 () ( );
2) 810: 90 = 9 () - ;
3)2 9 = 18 () .
:
1) ?
40 9 = 360 ()
2) ?
50 9 = 450 () 810 - 360 = 450 ().
3) , ?
450 - 360 = 90 () 50 - 40 = 10 () 10 9 = 90 ().
5. 18: 2 = 9 () ( ). 9? (1 8, 2 7, 3 6, 4 5.) 4 . .
) 8, 9.
8.
: 130 .
7.
8.
59
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 5, 7*, 8, 1.
1. . 1 9 . . . 1 ( , ), 1 . - 10 ; 1 , 9 , 1 . = 10 ; 1 , 9 . .
|
|
|
7*. 6, 5:
1) 30: 5 = () ;
2) 12 1 = 11 ();
3) 6 11 = 66 () 12 .
8. .
20544 35078 60184
+ 756 +47596 37945
18526781 +44154
23152 89455 6450
148733
5. 1) 10. 2) ) 4; ) 19; ) 12.
5.
() 2, 3, 4, 9, 6.
6. 5 . .
= 4 ∙ 6 = 24 ()
S = 6 6 = 36 (2)
= 16 = 56 = 56
S = 12m2 S = 124m2 S = 148m2
= 28 = 44 = 56
S = 48m2 S = 112m2 S = 160m2
 |
2. .
3.
. ,
. ,
,
.
: 4 3 .
4. = 234 531, = 48 456, = 1, = 340.
9..
1) - 48 = 82, = 130;
2) + 34 = 200, = 166; 166 - 130 = 36.
) 10, 11.
10. 27: (4 + 5) = 3 ().
7. 8.
60
