X - 539 = 61 • 73
x - 539 = 4453
x = 4453 - 539
x = 4992
1) 7585
95
---------
7680
2 (6738-834):123= 48(непонила как в столбик)
3 91793
÷ 307
--------------
299
299
23
----------
13
13
+77
-------
90
4 1092
÷ 39
-------------
28
28
× 25
----------
700
700
- 15
------------
685
-6п/3; -4п/3; -2п/3; 0; 2п/3;
-13п/9; -7п/9; -п/9; 5п/9;
<span>7/10</span> - <span>9/100</span> = <span>7·10/10·10</span> - <span>9·1/100·1</span> = <span>70/100</span> - <span>9/100</span> = <span>70 - 9/100</span> = <span>61/<span>100</span></span>