9
. . .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
)6*, 7.
6*. .
 |
1)9-1 = 8 ();
2) 8: 4 = 2 () ;
3) 9 - 2 = 7 () .
7. , .
2 ∙ <15 50:>20
2 ∙ 0 < 15 50: 1> 20
2 ∙ 15 50: 2 > 20
2 ∙ 2 < 15 50: 3> 20
2 ∙ 3<15 50: 3 = 16 (. 2)
2 ∙ 4 < 15- -1,2
2 ∙ 5 < 15
2 ∙ 6<15
2 ∙ 7 < 15
2 ∙ 8 < 15
-0, 1, 2, 3, 4, 5, 6, 7
5.
(.) 1, 2, 3, 4, 8, 5.
4.
1) 190-20 =170 ();
2) 190+ 170 = 360 ();
3) 360: 4 = 90 ().
) 9, 10.
9.
: 36 .
7.
8.
10
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 1, 2, 3.
2. .
, , . : , ; , . , .
5.
) 5, 6, 4*, 7, 8.
4*. .
1) 30 - 26 = 4 ;
2) 4 4 = 16 .
5. : 4 22 /. 2 ?.
1.1) 22 ∙ 4 = 88 (); 2) 88: 2 = 44 (/).
II. : , .
1)4:2 = 2 (.); 2) 22 2 = 44 (/).
|
|
|
6.
) 248 ∙ 3 - (375+ 124) = 245;
) (634 - 123) - 847: 7 = 390.
7. .
= 7 + (7-3) + (7-3) = 15()
= 7 + 7 + (7-3) = 18()
8. ? (27.) ? (3.) ? (27 3 = 81.) 81 27. 5, 81 5, 86. (81 + 5 = 86.)
27.
(86-59 = 27)
) 9, 10.
9. 1) 525 + (525 - 120) = 930 (.);
2) 1000-930 = 70 (.).
7.
8.
11
. . .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 1, 2, 3, 8.
1. , () : .
2. : , 2 .
1) 2 + 4:2 = 4; 2) 4 + 8:2 = 8.
3. 250 3 =750 ().
8. .
) 40 , 40
125 (85 + 40 = 125)
) 45 , 45 40 (85-45 = 40).
5.
() 5, 7, 9, 6, 9, 4*.
4*.
 |
. 8 . , 8 .
8 3 = 24 ().
5. , 4 , 3 2. , .
7.
220 -215 = 5 215 = 220 - 5
- 135 = 100 + 100 = 135
849 - 840 = 9 849 = 840 + 9
) 10, 11.
10. , . . 840 : 3 = 280 ().
7.
8.
12
