: 1)
2) ;
3) .
4) ;
5)
1.
2.
3.
4.
() 6, 5, 4*.
4*.
1) 26: 2 = 13 () .
, 13, 42.
6 7.
5. ABCD, ; ABC, , CDE, ACD ; , CED .
6.
2 9 437= 18 437 = 437 18
968 (10 + 1) = 968 11
9 300 + 9 72 = 9 (300 + 72) = 9 372
5.
() 3, 8, 1, 2, 7, 9.
2.
1) 20 + 25 = 45 () ;
2) 45: 9 = 5 (/) ;
3) 
20: 5 = 4 () ;
4) 25: 5 = 5 () .
7. ABDC .
= 16 ; = 4 ;
= 4 .
20: 2 = 10 () .
10 - 4 = 6 () .
BD 2 .
.
8.
1545 1 894 5633
1 545 1894 5 633
9. 28 + = 60
) 10, 11.
10. 100 + 120 = 220 ()
7.
8.
77
. . .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 8, 2, 5*.
2. , , D ;
, , D ;
, , D, , ;
, .
5*. 1) . ( ), 14 
. 2) . 12 . , 12. 637, . 3) . 365 (366) . , 365 (366). 637, .
8. 10 10.
30 5 10 = 305 10 = 3050 = 305
50 20 10 = 50 020 10 = 500 200 = 500 200
7 250 10 = 7250 10 = 72 500 = 72 500
2 300 10 = 2300 10 = 23 000 = 23
|
|
|
5.
() 3, 7, 6, 1, 4.
1. : .
3. : . , 3 . ».
+ 3 :
2 + 2 3 = 8 (); 3 + 3 3 = 12 ();
5 + 5 3 = 20 ().
4. 7200 48104 18 768
18 740 12 020 50 124
161232 30 045 12 530
20 012 14 581 24 030
6. (80 - 20): 3 = 20 ().
7.
100 = 800
= 800: 100
= 8
8 100 = 800
800 = 800.
6. () 9, 10.
9. (800 - 96): 2 = 352 ().
7.
8.
78
