3. .
9.
, . .
. 10, 6 4. 4 > 20? . 4 6, , . ( .)
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1.
) 20 , , , 20- (1\20)
) 8 , , , 8- (1\8).
2. ) 3 , 2 2\3.
) 5 , 3 3\5.
) 1\10.
3.
9:3 = 3 (.)
9 3 , 3 , 1\3.
5.
22 + (22 - 9) = 35 () 
6.
, ? ( 2 .) , ? (10 + 10 = 10 2 = 20.) ? ( .) ? (6.) ? (20 - 6 = 14.) , ?
10 + (10-6) = 14(.)
7.
(14 + 7-9):2 = 12:2 = 6
(46 - 8)+ (7-0) = 38+ 0 = 38
90 -(27 + 33) = 90 -60 = 30
.
8. .
9 + 5 = 14 9 + 5 = 14
14-8 = 6 14-7 = 7
6 + 6 = 12 7 + 8 = 15
12-3 = 9 15-6 = 9
.
.
10, 11, .29.
: 4 4
: 1) 4 4;
2) ;
3) , .
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3. .
3.()
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4 *.
. ( , 2 .) .
, 2 ? (.)
? (2 .) ? 2 + 2 = 4 ()
5. 3 7 . , ? ( .) ? ( .)
|
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? (3 + 7) 2 = 20 ()
? (20 = 5 + 5 + 5 + 5; 5 .)
.
6.
. 15
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7, .31.
: 4 4
: 1) 4 4;
2) ;
3) .
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