5.
(5 + 7) + (5 + 7) = 24 ();
(5 + 7) 2 = 24 ();
5 + 5 + 7 + 7 = 24 ();
5 2 + 7 2 = 24 ().
, .
II. I.
1) 52 = 10 () ;
2) 24 - 10 = 14 () ;
3) 14: 2 = 7 () .
II.
1) 24 = 12 + 12, 12 ;
2) 12-5 = 7 () .
III.
I.
1) 7 + 7 = 14 () ;
2) 24 - 14 = 10 () ;
3) 10: 2 = 5 () .
II.
1) 24 =12 + 12, 12 ;
2) 12-7 = 5 () .
.
.
7, .25.
:
: 1) ;
2) ;
3) .
.
.
3. .
.
.
3. , , 1 = 60 , 1 = 24 . .
4. , , .
8 30 + 4 = 12 30
5*. , 5 ? ( 5.) , 1 , ? ( 5 6 .) , 7 , ? (5 7 12.)
6. . , 25-(42) ,
25, 4 2. .
. .
7. ? , ?
.
8. , , .
80-(16+ 10) = 54 (.)
(80-16)-10 = 54(.)
(80 - 10) - 16 = 54 (.)
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.
.
9, 10, .27.
: . 1\2 1\3
: 1) ;
2) 1\2 ;
3) .
.
