: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 10, 4, 6*.
4.
19 - 15 30 = 18 60 - 15 30 = 3 30 .
6*. . : 10, 11, 12, 20, 21, 22 6 .
10. : 23 - (16 - 8) ≠ 23 - 16 - 8.
5.
() 1, 2, 3, 5, 8, 9, 7.
1. :
b ;
1) b: 3 () ;
2) b + b:3 () ;
3) b b: () , .
b = 48:
1)48: 3 = 16; 2) 48 + 48: 3 = 64; 3)48 48: 3 = 32.
b = 33:
1)33: 3 = 11; 2)33 + 33: 3 = 44; 3) 33 33: 3 = 22.
2. : + 5 ∙ . = 224; 224 + 5 224 = 1344.
8.
) + 64 = 804; ) - 48 = 24;
= 740. = 72.
9.
 |
1) 56 - 14 = 42 () ;
2) 42 : 2 = 21 () ;
3) = 56 + 42 + 21 = 119().
6. () 11, 12.
11.
1) 7 + 9 = 16 () ;
2) 48: 16 = 3 () ;
3) 3 ∙ 7 = 21 () ;
4) 3 ∙ 9 = 27 () ;
4) 48 - 21 = 27 ();
4) 9 - 7 = 2 ();
5) 3 2 = 6 ();
6) 21 + 6 = 27 ().
12.
24 291; 91 814; 21 708; 145 748; 433 838; 125 877.
7.
8.
61
. .
: 1) .
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 2, 3, 6*.
2.
32 489 > 3*588 (0, 1); 35 389 < 353*9 (9);
8* 785 < 807*3 ( 0, 9);
7* 651 > 78 300 (8, 9).
3. : 127 110; 18101 100.
6*. 4 ∙ 3 = 12 (); 12: 2 = 6 ();
6 ∙ 3 = 18 ().
5.
() 4, 1, 5, 7, 8.
1. , . , . , .
|
|
|
I.
1) 4 ?
2) 4 ?
3) 4 ? ( 2 4 ?)
1) 75 ∙ 4 = 300 ();
2) 60 ∙ 4 = 240 ();
3) 300 + 240 = 540 ().
.
 |
1) ( )?
2) 2 4 ?
1) 75 + 60 = 135 (/);
2) 135 ∙ 4 = 540 ().
4. + 152 ;
( + 152) - 68 , .
= 378, ( + 152) - 68 = (378 + 152) - 68 = 530 --68 = 462.
5.
) 8370- = 7853, = 517;
) 1200 - = 800, = 400;
) - 5020 = 1840, = 6860.
7.
1111; 1113; 1131; 1133; 1311; 1313; 1331; 1333;
3111; 3113; 3131; 3133; 3311; 3313; 3331; 3333.
8.
AKMD: 5 ∙ 3 = 15 (2).
SEPO: 3 ∙3 = 9 (2).
:
15 + 9 = 24 (2) 3 (5 + 3) = 3 8 = 24 (2).
) 9, 10.
9.
(6 + 5) 2 = 22 () 6 ∙ 2 + 5 ∙ 2 = 22 ().
7.
8.
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