1 (. 88)
11: ; ( ), ( 1 , ).
11: , .
: .
2 (. 88)
, . 1537, 1537?
2458, 4916? . .
(11, 22, 33, 32).
( ).
4 (. 88)
3 (. 88)
. : 420 . 1050 ., 7 . ?
1) 1050 + 420 = 1470 (.);
2) 1470:7 = 210 (.);
3) 1050:210 = 5 (.);
4) 420:210 = 2 (.).
10 (. 89)
25 5=125 (.)
125+25=150 (.)
750:150=5 ()
6 (. 89)
. :
9 : 4 = 900 : 4 = (800 + 100): 4 = 200 + 25 = 225 () = 2 25 .
:
: ; .
2.
:
1/5 4 * ½ 1700
1/6 6000 * ¼ 56
1/5 4500 * 90
1/3 6 * 30
½ 100 * ½ 6
1/7 8400 * ½ 18
6 (. 91)
. . : 6<90, 6=90, = 15;
= 0, 1,2,3,4,..., 14.
:15>9 (160, 175,...);
400 = > 40(1, 2, 4, 5, 8);
+ 72<100 (0, 1, 2,..., 27).
7 (. 91)
: 5 > 2; 5 . , : , , , 4 , . .
:
▪ 11 4 . , 450 ?
▪ 40800 , 1200 . ?
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▪ 3 25000 4 12000 . ?
5 (. 91)
600 200 , 800 . . , 400 .
400 - 200 = 200 () 4 .
200 : 4 = 50 () .
8* (. 91)
15 + 3 = 18 (.)
18: 3 = 6 (.) ;
15 6 = 9 (.) .
. __________________________
. _____________________ 15+3
1 (. 90)
2 (. 90)
1) 96 - 64 = 32 (.) , ;
2) 32: 2 = 16 (.) ;
3) 96: 16 = 6 () ;
4) 64: 16 = 4 () .
. : 2 32 . (96 - 64 = 32.)
96 3 , 64 2 (6 4 ).
3 (. 90)
19 075; 50; 290; 54 060.
4 (. 91)
S1 = 8 6 = 48 (2); S2 = 4 12 = 48 (2); S1 = S2.
1= 2 (8 + 6) = 28 (); 2 = 2 (4 + 12) = 32 (); 1 < 2.
7. : 9, 10 (. 2,3), . 91
:
: , 0; .
2.
3 ?
1
6000+5000
14000-7000
120*4
7200:6
820: 2
6500: 5
7150+280
9700-350
8600-1200
16000:2
18000:90
50*70
800*4
200*6
2
4000+8000
12000-6000
140*2
6400:4
860:2
8400:7
3560+440
7860-1160
21000:7
24000:80
60*30
4900-3100
5*700
7*300
3 (. 92)
) 15 , 15 . 15 30 45 :
(30 45): 15 = (30: 15) 45 = (45: 15) 30 = 90.
) (75 22): 11 = 75 (22: 11) = 75 2 = 150.
7 (. 92)
, , .
13318 * 9239
3918*1839 , , .
4 (. 93)
. : 6000, 300, 1800, 200, 500, 4800.
3 65 4 35 . 1/5 . ?
5 200 . 10 40 . ?
5 , 3 . 160 . ?
5* (. 93)
30 , 10 . 5 . 25 , 10 , 50. , 40 . (50 - 10 = 40.) 8. (40 = 5 = 8.)
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