: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 5, 6.
5. :
S = b.
. ) ) ).
6. 40 40. 40, 80 ( 40, , 40, ).
5.
() 1, 2, 4, 7, 3*.
1.
S = 90 40 = 3600 (2); = (90 + 40) 2 = 260 ().
2.
18 10
360 ?
18 360 ?
360: 18 = 20 (.)
, 20 10 ;
10 ∙ 20 = 200 ().
3*.
= 2-( + ); = 1708 ;
1708 : 2 = 854 () ( ).
.
(854 + 58) : 2 = 456 () .
7. 140; 730; 301; 48; 340; 166.
) 8, 9.
8. S = a b.
1) S = 24 2, = 6 , b = 24: 6 = 4 ();
2) S = 24 2, b = 4 , = 24: 4 = 6 ();
3) = 6 , b= 4 , S = 6 4 = 24 (2).
7.
8.
46
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 3, 1, 4*.
3. : 100 , 150 , 500 , 600 .
4*. . . :
1)400 + 300 + 440 = 1140(.) ;
2) 1140: 2 = 570 (.) ;
3) 570 - 400 = 170 ();
4) 570 - 300 = 270 ();
5) 570 - 440 = 130 ()
1)400 + 300 = 700 (.);
2) 700 - 440 = 260 (.) ;
3) 260: 2 = 130 ().
.
5.
() 2, 5, 6.
2. . :
|
|
) 5000 + (5000 - 1) = 5000 + 4999 = 9999 . .
5.
) 7, 8.
7. 4 , 16 , . 12 , 4 . . 12 . 12 , . 4 4 , .
7.
8.
47
. .
:
1) .
2)
3) ;
4) ;
5)
1.
2.
3.
4.
() 2, 4, 5*.
2. .
S, = 10 10 = 100 (2);
S2 = 20 4 = 80 (2);
S3 = 300 2; S4 = 1 = 10 000 2.
, S2 < Sx < S3 < S4.
4. : ; ? , : ) 40 15 25 (40 - 15 = 25) . . .
5*. (1, 2, 3) . . 4 , . , , , . , . 4.
1) 4: 2 = 2 (.) ;
2) 4 + 2 = 6 (.) .
5.
() 1, 3, 6, 7, 8, 9.
1. :
1 =100 ∙ 100 = 10 000 2.
3. 210: (30 + 40) = 3 ().
6. 4 , 5 : 4 4 . -:
1) 5 ( 3 ):
S, = 6 3 = 18 (2); S2 = 6 12 = 72 (2);
2) :
S = 15 6 = 90 (2). 90 5 : 90: 5 = 18 (2);
18 4 = 72 (2). 18 2. (72 2) 4 . , .
8. , , . ABC. .
9. . 30 427; 23 000; 703 000; 470 470.
) 10, 11.
10. 950 - (85 + 110) = 755 (.).
7.
8.
48
. .
|
|
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 2, 5, 7, 4*.
2. 135: 9 = 15 ().
4*. ), ), ).
5. 60 , 5 . , (60 ) 5 . 12 (60: 5 = 12), 3 36
(12 3 = 36), 8 (5 3) 1 36 .
5.
() 1, 3, 6.
1. , .
7 2 = 700 2 5600 2 56 2
5 2 = 500 2 300 2 = 3 2
3. .
I.
1) 478 ∙ 3 = 1434 () ;
2) 478 + 1434 = 1912 () ;
3) 1912 + 1434 = 3346 () .
II. 7 .
478 ∙ 7 = 3346 ()
6. .
276 - (76 + 189) = 276 - 76 - 189 = 200 - 189 = 11.
) 8, 9.
8. 372 + (372 - 43) = 701 ().
7.
8.
49