: 1) .
2)
3) ;
4) ;
5)
1.
2.
3.
4.
() 7, 5*, 2.
2. , .
) 12, 69 : ;
) 15, 90;
) 15 + , 9;
) 55, 30-.
5*. . 100. (100) 9 . , 90.
7.
180 : 4 ;
60 - 180: 4 ;
60 4 - 180 4 , .
5.
() 6, 3, 4.
3.
5 = 1000 - 820. . : 5 = 180. :
= 180: 5; = 36.
* . . , 9 . , : 9 ∙ = 900 - 450 . .
: = 50.
4. .
1) 150 - 47=103 ();
2) 103 3 = 309 ().
6. 380; 390; 1; 180.
) 9, 8.
8.
I. 560: 8 12 = 840 ().
II. 560: 2 3 = 840 ().
9.
) 609 + (334 - 140) = 803;
) (500 - 419) - 47 = 34;
) 183 ∙ 5 + 302 = 1217.
7.
8.
40
. .
: 1) .
2)
3) ;
4) ;
5)
1.
2.
3.
4.
() 6*, 7, 2, 9.
2. ) , 50 : , 8; ) , 20, 10 ; ) , 20-, 7; ) , 12, + 7.
6*.
5 ∙ (5: 5 +5): 5 = 6; 5: (5 5: 5) + 5 = 6.
7. .
4696 -1548 = 3148; 334 ∙ 3 = 1002; 512: 8 = 64.
|
|
|
9. : , , . 8 . , , , , ; , , , . .
5.
() 8, 3, 5, 4.
3. .
3 ∙ =100 - 1 * - 5 + 80 = 100
3 ∙ = 99 - 5 = 100 - 80
= 99: 3 : 5 = 20
= 33 = 20 ∙ 5
= 100
3 ∙ 33 = 100 - 1 100: 5 + 80 = 100
99 = 99 20 + 80=100
100 = 100
4. 23 : 23, 23. .
 |
: 46 , .
5. : , , , , , , , . .
 |
8. 40 897; 7300; 25 000; 2005; 900 000; 720.
) 11, 10.
10.
1) 276 + 468 = 744 () ;
2) 276 + 744 = 1020 () ;
3)1020 + 75 = 1095 () .
7.
8.
41
