: 1) ;
2) ;
3) ;
4) ;
5)
1.
2.
3.
4.
() 5, 4, 6*.
4. S=- b. () 3 , () 4 . , () 12 . .
5.
1 = 1/100; 1 = 1/100 ; 1 = 1000; 1 = 1/10; 1 = 1/1000; 1 = 1/24.
6*. 4 , 4 .
1) 26 + 4 = 30 (.) .
 |
:
30 .
2) 30: 3 = 10 (.) ;
3)26 - 10 = 16 (.) .
5.
() 3, 1, 2, 8, 9, 7.
2. : 4220 + 2548 + 1230 = 7998 (). .
3.
) 49 998; 49 999; 50 000; 50 001; 50 002;
) 30 001; 30 000; 29 999; 29 998; 29 997.
9. , 168 , . 28 4 /. ?
I.
1) 28: 4 = 7 () ;
2) 168: 7 = 24 (/) ( );
3) 24 - 4 = 20 (/) .
II.
1) 28: 4 = 7 () ;
2) 168 - 28 = 140 () ;
3) 140 : 7 = 20 (/) .
) 10, 11.
10. .
 |
1) 4829 - 2521 = 2308 ;
2) 4829 - 3884 = 945 ;
3) 2308 + 945 = 3253 ;
4) 4829 - 3253 = 1576 .
7.
8.
52
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 8, 7, 9, 5*.
5*. , , , 10 . 10 : 2 = 5 (.) .
7. . :
|
|
|
459 - 240 - 148 < 459-(240-148), 459 240 148 ( ), . , .
145 ∙ 3 ∙ 4 = 145 ∙ (3 ∙ 4)
8. , . , . ? ( 4; 12 - 8 = 4.)
9. :
+ 333 < 800; + 333 = 800, = 467;
< 467(0, 1, 2, 3, 4,..., 466);
- 333 > 800, > 1133; - 800 > 333, > 1133;
∙ 8 < 25 000, < 3125; 782 - > 750, < 32:
200 ∙ < 4500; <23.
5.
() 3, 1, 4, 6, 2.
2. .
I.
1) 70 2 = 140 () ;
2) 70 4 = 280 () ;
3) 140 + 280 = 420 () .
II.
1) 4: 2 = 2 () ;
2) 70 2 = 140 () ;
3) 140 2 = 280 () ;
4) 140 + 280 = 420 () .
III.
1) 2 + 4 = 6 () ;
2) 70 6 = 420 () .
3. .
) (58 + 107) 6 = 990; ) 58 + 107 6 = 700;
) 58 ∙ 6 + 107 = 455.
4. , 100.
 |
) 10, 11.
10. 175: 5 9 = 315 ().
7.
8.
53
