: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 3, 6*, 4.
3. 820; 602.
4. 12 80 = 4 = 3 20 = 320 .
6*. (), :
35 - 10 = 25 (.) ;
25 - 20 = 5 (.) ;
11-5 = 6 (.) ;
20 - 6 = 14 (.) .
5.
() 7, 5, 1, 8, 2.
1. . .
2. .
I.
1) 340: 5 = 68 () ;
2) 340 - 68 = 272 () ;
3) 272: 4 = 68 () ;
4) 340 - (68 + 68) = 204 () .
II. : , . , , .
1) 340: 5 = 68 () ( );
2) 68 3 = 204 () .
5*. :
5330; 5303; 5033; 3530; 3503; 3350; 3305; 3053; 3035.
7. 325; 3736; 674; 9289.
8. . :
2 6 3 = 7 8 .
) 9, 10.
9. 1440 .
10. 21 005 43 020 203 010
125 025 107 001 21001
7.
8.
93
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 1, 3, 4*, 9.
3. DABC, KABM, DABM, .
4*.
1) 42: 2 = 21 () ;
2) 21: 3 = 7 () ;
3) 7 2 = 14 () .
9.
40 ∙ (18-12):3 = 80
(40 ∙ 18 -12): 3 = 236
40 ∙ (18 12: 3) = 560
5.
() 6, 5, 2, 8, 7.
2.
, , , . 96 2520 .
|
|
|
1) 2616 - 96= 2520 (.);
2) 2520: 3 = 840 (.) ;
3)840 + 96 = 936 (.) .
5.
2 800 = 28 ;
280 < 2 800 ;
28 > 280 .
7.
9 = 87 000 - 86 919;
∙ 9 = 81;
= 81: 9;
= 9;
9 ∙ 9 = 87000 - 86 919;
81 = 81.
8.
, .
2 . .
= 8
= 16
P = 2 ∙ (a + b)
16 : 2 = 8 ;
8 - 2 = 6 () .
.
() 10, 11.
10.
I.
1) 3600: 4 = 900 (.) ;
2) 900 + 100 = 1000 (.) ;
3) 3600 - 1000 - 900 = 1700 (.) .
II. . ( ) 100 .
3600: 2 -100 = 1700 (.)
7.
8.
94
