: 1) () ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 7, 6, 5*.
5*. , . , 2 3, : 1 2, 2 3. , 3, , 1.
 | |||
 | |||
6. 16 (4 ∙ 4 = 16).
8 (2 4 = 8).
2 (16:8= 2).
7. : () .
5.
() 3, 4, 1, 2.
1.
(140+ 360) ∙ 2 = 1000;
140 ∙ 2 + 360 ∙ 2 = 1000.
2.
1)21 0:3 = 70 (/) ;
2) 70 - 10 = 60 (/) ;
3) 3 ∙ 2 = 6 () ;
4) 60 6 = 360 () ;
3. .
2 ∙ 37 + 5 ∙ 37 = (2 + 5) ∙ 37 = 7 ∙ 37
2 2674 + 2674 ∙ 4 = 2 ∙ 2674 + 4 2674 = (2 + 4) 2674 = 6 2674
2 ∙ 2674 + 2674 4 = 2674 2 + 2674 4 = 2674 (2 + 4) = 2674 ∙ 6 . .
4. 7 - 2 = (7 - 2) = 5 . .
) 8, 9.
8. 10: 2 = 5 (); 3 ∙ 5 = 15 (.)
7.
8.
69
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 3, 8, 7, 6*.
3. 390 000 39 001, , , . .
6*. , , :
(0 , 70 ) -> (30 , 40 ) → (0 , 40 ) -> (30 , 10 ) → (0 , 10 ) → (10 , 0 ) →
→ (10 , 70 ) → (30 , 50 ).
7. :
55 ∙ 4 , ;
|
|
|
60 ∙ 4 , ;
60 - 55 .
60 4 - 55 4 (60 - 55) ∙ 4 : , .
8. 12 20 8 ;
16 24 0 ; 24 8 .
5.
() 1, 4, 5, 2.
1. :
6000 ∙ 2 = 6 . ∙ 2 = 12 . = 12 000 . .
2.
 |
1) 43 + 56 + 18 = 117 () ;
2) 120 - 117 = 3 () ;
3) 3: 3 = 1 () ;
4) 1 + 43 = 44 () .
4. ) 50 750 + (2340 - 145) = 52 845;
) (4900 - 3197) - 490 = 1213;
) 1700 ∙ 5 + 2060 = 19 560.
6. () 9, 10.
9. (17 + 25) 8 = 42 8 = 336 (.) 17 8 + 25 8 = 336 (.)
10. 360: 4 + 240: 4 = 90 + 60 = 150;
360: 4 + 240: 4 = (360 + 240): 4 = 600: 4 = 150.
7.
8.
70
