: 1) ; 2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 2, 7, 5*.
2. ? (7 .) ? (8 10 .) ? (13 .) ? (13 15 .) ?
(21 15 .)
1) 8 10 - 7 05 = 1 5
2) 13 - 8 10 = 290 = 4 50
3) 13 15 - 13 = 15
4) 24 - 21 15 = 2 45 6 30 .
2 45 + 6 30 = 9 15 .
5*. 1 20 , 2, 3, 4. 1 20. , , 4, , . 4, 8 . ., , 12 2, 3 4 .
7. , 3 6 . ? . , .
 |
5.
() 1, 3, 4, 6.
1. .
3 12 = 60 ∙ 3 + 12 = 192 ;
2 35 = 60 2 + 35 = 155 ;
12 = ½ ; 4 = 1/6 ; 8 = ⅓ ;
3 = ⅛ ; 6 = ¼ ; 2 = 1/12 ;
1 = 1/24 .
4.
1) 15 ∙ 4 = 60 (); 2) 96 - 60 = 36 ();
3) 36:12 = 3 ().
) 8, 9.
8. 48: 4 5 = 60 ().
9.
700 000; 440 200; 401 060; 300 040; 100 000; 60 500; 60 400; 37 005.
7.
8.
30
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 3, 5, 4, 6.
3. , . :
25 = 2500 , , 25 < 2525 ;
40 025 > 4 (40 025 > 400 ) . .
4. ), 360 , 50 (360 + 50). (360 + 50) + 360 = 770 ().
|
|
|
5. : 3 63 4 46 . , ?. ( , .).
6. 7 .
 |
5.
() 1, 2, 9, 7, 8*.
8*. . (450: 3 = 150 /.)
.
I.
1) 150-30 = 120 (/);
2) 120:2 =60 (/);
3) 60 + 30 = 90 (/).
II.
1) 150+ 30 = 180 (/);
2) 180: 2 = 90 (/).
9. .
90 75: 5 = 90 - 15 = 75
400 - 15 6 + 390 = 400 - 90 + 390 = 310 + 390 = 700
) 10, 11.
10.
 |
I. (100 + 20) 3 = 360 ().
. 100 3 + 20 3 = 360 ().
III.
1) 100 ∙ 3 = 300 (); 2) 100: 20 = 5 ();
3) 300: 5 = 60 (); 4)300 + 60 = 360 ().
7.
8.
31
