: /) , 0;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 3, 7, 4, 5*.
3. ) 15 , 15 . 15 30 45 :
(30 45): 15 = (30: 15) 45 == (45: 15) ∙ 30 = 90.
) (75 22): 11 = 75 (22: 11) = 75 2 = 150.
4. . : 6000, 300, 1800, 200, 500, 4800.
5*. 30 , 10 . 5 . 25 , 10 , 50. , 40 . (50 - 10 = 40.) 8. (40: 5 = 8.)
7. , , .
13 ∙ 3 ∙ 18 * 9 ∙ 2 ∙ 39 39 ∙ 18*18 ∙ 39
, , .
5.
() 1, 2, 6.
1. . : 0 , , .
2.
3 850 = 3850 .
1) 800 13 = 10 400 (2) ,
;
2) 10 400:100 = 104 () 100 2;
3) 3850 104 = 399 400 () = 399 400 .
6.
15 2 = 1500 2; 20 2 = 2000 2;
52 2 = 5200 2; 2 = 20 000 2.
) 8, 9.
8.
4200 ∙ 10 = 42 000 ();
4600 ∙ 7 = 32 200 ();
42 000 - 32 200 = 9800 ().
9. 117 465 101706 5
204 896 282 204 29
7.
8.
110
. .
: 1) ; 2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 4*, 7.
4*. 1 .
 |
1) 105-3 = 102;
2) 102: 3 = 34 ;
|
|
|
3) 34 + 1 = 35 ;
4) 35 + 1 = 36 .
, .
7. ) , 563,
) , 155, ) , 670, ) , 725.
5.
() 1, 2, 3, 5, 6.
1. .
2160: (72 + 48) = 2160:120 = 18 () 1 ;
18 72 = 1296 () ;
18 48 = 864 () 2160 - 1296 = 864 () .
3. 2300 , 170 , 5 , 130 , 64 , 1270 , 1520 , 14 , 1460 ,
180 .
5.
+ ( - ); 28 370 + (35 778 - 782) = 45 356;
( + ) - ; 28 370 + 35 778 - 782 = 45 356. .
6. ) ; ) ; ) ; ) .
) 8, 9.
8. .
: 36 .
9. 247, 1222.
7.
8.
111
