: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 1, 8, 7*.
1. ) 0, 0; 1, 1(1 = 1 ∙ 1); 2, 2, 1 (2 = 2 ∙ 1);
3 = 3 ∙ 1 = 1 ∙ 3; 4 = 4 ∙ 1 = 1 ∙ 4 = 2 ∙ 2; 5 = 5 ∙ 1 = 1 ∙ 5.
) 1 + 1 +... + 1 = 150;
) 0 + 0 + 0 + 0 + 0 + 0 + 0 = 0.
7*. .
 |
I.
1) 10+19 + 23 = 52 (.) ;
2) 52: 2 = 26 (.) ;
3) 26 - 10 = 16 (.) ;
4) 26 - 19 = 7 (.) ;
5) 26 - 23 = 3 (.) .
II.
1) 19 + 23 = 42 (.);
2) 42-10 = 32 (.)
3) 32:2 = 16 (.);
4) 19-16 = 3 (.);
5) 23-16 = 7(.).
5.
() 4, 2, 6, 5, 3, 8.
3. 10 = 720; = 72.
4.
 |
1) 4 + 5 = 9 (.) ;
2) 207: 9 = 23 (.) ;
3) 23 5 = 115 (.) (4 );
4) 23 4 = 92 (.) 207 - 115 = 92 (.) (4 ).
5. . : ; : ∙ 3 = 230-215; ∙ 3 = 15. . :
= 15: 3; = 5 . .
6.
1) 15 5 = 75 (2) ( );
2) 3 3 = 9 (2) ;
3) 75 - 9 = 66 (2) .
8. . :
120 ∙ 1 + 18 = 138; 20 ∙ 6 - 19 = 101;
278 ∙ 0 + 999 = 999 . .
) 9, 10.
9.
48: 6 = 8 (); 100 8 = 800 () ;
48: 8 = 6 (); 100 6 = 600 () .
7.
8.
67
. .
: /) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 2, 5, 4*.
2. . :
5 320 2 = 320 (5 2) = 320 ∙ 10 = 3200 . .
4*. : , 5 . , 60 , 300 ( 60 ).
|
|
|
 |
5. 9999 + 100 + = 10 099; = 0.
5.
() 1, 3, 6, 7, 8.
1. : 3 5 , 5 3 . : 5 3 = 3 5 = 15 . .
. : ∙ b = b ∙ .
3. 2 . , .
1) 
? 2) ? ( ?) 3)
? 4)
?
I.
1) 80: 2 = 40 (/);
2) 240: 80 = 3 ();
3) 40 ∙ 3 = 120 ();
4) 120 + 240 = 360 ().
II.
,
.
1) 240: 2 = 120 () ;
2) 240 + 120 = 360 ()
.
7. 1120 2.
8. = 503 729 + 895; = 504 624.
) 9, 10.
9. I. (350 + 50): 5 = 80 ().
II. 350: 5 + 50: 5 = 80 ().
7.
8.
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