: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 7, 3, 5*.
3. 120: < 3 (120, 60)
∙ 25 > 250 (11, 12, 13,...)
22 ∙ >100 (5, 6, 7,...)
d:30<7 (30, 60, 90,..., 180)
5*.
 | |||
 |
5.
() 1, 2, 6, 4, 8.
1. 236; 467; 2134; 2371; 2132; 1324.
2.
I.
1) 18+15 = 33 () ( ) ;
2) 33 - 25 = 8 () .
II.
1)25-18 = 7 () ;
2) 15-7 = 8 () .
4. , , . .
6.
120 ;
?, 60 .
= 360 = 36 ; S = 7200 2 = 72 2.
) 9, 10.
9.
24 5 = 120 (); 120: 4 = 30 (); 120 - 30 = 90 ().
10. 27; 42; 24; 17; 44; 27; 38; 942; 74.
7.
8.
118
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 5, 8, 4*.
4*.
5.
42 ∙ 16: 8 > 42 ∙ 8:16;
234 (567 + 8910) > 234 567 + 8910;
666 25 = 222 75,
666 25 = (222 3) 25 = 222 ∙ (3 25) = 222 75;
111 45 = 111 (3 15) = (111 3) 15 = 333 15.
8.
, 5638 = 5 638 .
, 5638 = 5 638 .
, 1/10 = 10 .
5.
() 6, 3, 1, 2, 7, 9.
1. 324; 807; 28; 136; 254; 940.
2. 23 - 8 = 15 () .
I.
1)28 ∙ 15 = 420 () ;
2)945 - 420 = 525 () ;
3)525: 15 = 35 (/) .
II.
1)945: 15 = 63 (/) ;
2)63 - 28 = 35 (/) .
3. 1 = 10 000 2.
|
|
|
1) 200 000:10 000 - 20 () 1 2;
 |
2) 525 100 = 52 500 (2) ;
3) 20 52 500 = 1 050 000 ().
6.
) 56 65 - (466 + 2175) = 999;
) 5867 + 10 794: 42 = 6124;
) 405 62 + (24 600 - 5607) = 44 103.
 |
7. ,
.
) 10, 11.
10.
 |
: 7 .
11. 132; 338; 789; 537; 5; 7.
7.
8.
119
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 4, 6, 8*.
4. 12 10 + 12 4 = 12 14
25 ∙ 10 + 25 ∙ 7< 25 ∙ 70
17 ∙ 6 ∙ 10 = 17 ∙ 60
41 ∙ 10 + 41 ∙ 9 < 41 ∙ 90
6. . : 360 / = 21600 / = 21 600 / 360 / =
=360: 60 = 6 / . .
8*.
 |
I.
1) 15-7 = 8 (.) ;
2) 8 - 4 = 4 (.) ;
3) 5 + 4 = 9 (.) .
II.
(15 - 7) + (5 - 4) = 9 ().
5.
() 1, 2, 3, 5, 7.
1. . : 123 73 = 8979. , :
20 075: 73 = 275; 22 995: 73 = 315;
7384:52 = 142 . .
2. . ? ? ? , . ?
1) 15 + 3 = 18 (/) ;
2) 180: 18 = 10 () ;
3) 15-3 = 12 (/) ;
4) 180: 12 = 15 () ;
5) 10 + 15 = 25 () .
: 360: 15 = 24 ().
3.
45: 9 = 5 () ;
= 2 ∙ (9 + 5) = 28 ();
ABMN ;
S = 25(2);
= 20().
) 9, 10.
9.
.
I.
1) 640: 5 = 128 () ;
2) 640 - 128 = 512 () .
II.
128 ∙ 4 = 512 ().
7.
8.
120
