542. Выполните сложение:
1 7
5
1) 3
+ 2
; 3) 9
25
18
+6
1
12
;
5
5) 54 + 2а,
+
24
7 2
2) 2 +9
10
7 5
4) 1 + 3
12
6) 3
1 2
+4
12 15
15
9
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