: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 2, 7, 6*.
2. : , .
. : 5 76 ≠ 350.
6*. 1 31 92 . (30 + 31 + 31 = 92.)
17 ∙ 92 = 1564 () = 1 564 .
:
17 30 = 510 () ;
17 31 = 510 + 17 = 527 () ( );
510+ 527+ 527 = 1564 ().
7. : 793 8 18 = 18 8 793 ( , );
754 4 17 < 4 17 755 (754 < 755);
42 ∙ 6 ∙ 10 = 42 ∙ 60 (6 ∙ 10 = 60);
37 5 10 < 73 5 10 (37 < 73).
5.
() 1, 4, 5, 3, 8.
1. . : , ; , .
4.
135: (12+ 15) = 135: 27 = 5 ().
5.
107 868; 37 227; 9305; 84 000.
8.
1 2 = 100 2; 1 2 1 2 99 2;
16 16 144 (160 - 16 = 144 );
7 7 10 (70: 7 = 10).
6. () 9, 10.
9.
(300: 6 + 10) 6 = 360 () 300+10 ∙ 6 = 360 ().
10.
1134 2550 1786 1472
3649 4648 1242 2376
7.
8.
106
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 1, 9, 4, 7, 6*.
4.
45 < 9 ∙ 39 ∙ 5 (45 < 39 ∙ 45)
32713 < 3928 (3927 < 3928)
63 < 3 7 4 (63 < 84)
4 9 34 < 35 ∙36 (36 34 < 36 35)
6*. (200 ) 60 , 260 . . , 130 . , 130 .
|
|
9. ) 6 , 6 ; 3 , 3 . 2 . (6:3 = 2.);
) 2 .
5.
() 5, 2, 3, 8.
2.
1) 420-375 = 45 ();
2) 45: 15 = 3 ();
3) 420: 3 = 140 (.) ;
4) 375:3 = 125 (.) .
5. 750 000; 90 000; 262 500.
8. 1 2 = 12 ; 40 = 4 ;
12:2 = 6 () ;
6 - 4 = 2 ; 2 4 = 8 (2).
) 10, 11.
10. 15 75 = 1125 (); 15 84 = 1260 ().
11. 60 480 622 500 347 070 28 944 113 400 220 500
7.
8.
107