1
00:00:00,050 --> 00:00:01,850
La inceputul saptamanii

2
00:00:01,850 --> 00:00:03,783
contul curent al lui Stewart avea un sold

3
00:00:03,783 --> 00:00:07,200
negativ de 15 dolari si 8 centi.

4
00:00:07,200 --> 00:00:09,800
Luni dimineata a depus un cec

5
00:00:09,800 --> 00:00:12,733
de 426 dolari si 90 de centi.

6
00:00:12,733 --> 00:00:15,488
Marti dimineata a depus un alt cec

7
00:00:15,488 --> 00:00:17,160
de o suta de dolari.

8
00:00:17,160 --> 00:00:19,692
Ce suma se afla in contul curent al lui Stewart

9
00:00:19,692 --> 00:00:24,861
dupa cel de-al doilea depozit, deci dupa amandoua depozitele de aici?

10
00:00:24,861 --> 00:00:27,237
Deci incepe cu un sold negativ,

11
00:00:27,237 --> 00:00:28,200
un sold negativ inseamna

12
00:00:28,200 --> 00:00:31,131
ca a cheltuit mai mult decat avea disponibil in cont.

13
00:00:31,131 --> 00:00:32,017
De fapt, este dator bancii acum.

14
00:00:32,017 --> 00:00:34,918
Din fericire, acum o sa puna bani in contul sau,

15
00:00:34,918 --> 00:00:38,615
drept urmare va avea un sold pozitiv in contul curent.

16
00:00:38,615 --> 00:00:43,467
El incepe cu o datorie de 15 dolari si 8 centi,

17
00:00:43,467 --> 00:00:45,302
iar la aceasta adauga

18
00:00:45,302 --> 00:00:49,889
426 dolari si 90 de centi.

19
00:00:49,889 --> 00:00:51,867
Apoi adauga inca o suta de dolari.

20
00:00:52,317 --> 00:00:59,791
Deci, a inceput cu un minus de 15 dolari si opt centi,

21
00:00:59,791 --> 00:01:03,507
la care adauga 426 dolari

22
00:01:03,507 --> 00:01:04,867
si 90 de centi si 100 de dolari.

23
00:01:04,867 --> 00:01:09,358
Asta inseamna 526 si 90 de centi.

24
00:01:09,358 --> 00:01:11,473
Drept urmare, ce suma va avea in contul sau?

25
00:01:11,473 --> 00:01:14,838
A inceput cu o datorie de 15 dolari si opt centi,

26
00:01:14,838 --> 00:01:15,674
iar la aceasta adauga

27
00:01:15,674 --> 00:01:18,832
526 dolari si 90 de centi.

28
00:01:18,832 --> 00:01:20,086
Un mod de a privi problema

29
00:01:20,086 --> 00:01:23,000
este sa ne gandim la ea pe o axa a numerelor,

30
00:01:23,250 --> 00:01:25,798
cu zero aici.

31
00:01:25,798 --> 00:01:31,000
El incepe la punctul -15.08,

32
00:01:31,000 --> 00:01:32,160
la care va adauga

33
00:01:32,160 --> 00:01:37,222
526 dolari [si 90 de centi].

34
00:01:37,222 --> 00:01:40,733
La stanga avem 15.08,

35
00:01:40,733 --> 00:01:41,817
suma pe care o datoreaza,

36
00:01:41,817 --> 00:01:43,631
iar la aceasta va adauga

37
00:01:43,631 --> 00:01:46,333
526 [dolari si 90 de centi].

38
00:01:46,333 --> 00:01:47,950
Nu desenez acest lucru la scala,

39
00:01:47,950 --> 00:01:49,203
dar la suma aceasta va adauga

40
00:01:49,203 --> 00:01:54,358
526 dolari si 90 de centi.

41
00:01:54,358 --> 00:01:55,962
Deci, soldul pozitiv pe care il va avea

42
00:01:55,962 --> 00:01:57,284
va fi

43
00:01:57,284 --> 00:01:59,420
526 dolari si 90 de centi

44
00:01:59,420 --> 00:02:02,021
minus 15.08.

45
00:02:02,021 --> 00:02:03,275
Drept urmare va fi distanta aceasta,

46
00:02:03,275 --> 00:02:09,726
aceasta suma va fi pozitiva.

47
00:02:09,726 --> 00:02:13,733
Va fi 526,90

48
00:02:13,733 --> 00:02:16,510
minus 15,08

49
00:02:16,510 --> 00:02:17,467
Deci va fi -

50
00:02:17,467 --> 00:02:20,225
si putem sa rescriem aceasta

51
00:02:20,225 --> 00:02:21,851
ca sa arate asa.

52
00:02:21,851 --> 00:02:24,219
Este exact acelasi lucru precum

53
00:02:24,219 --> 00:02:26,495
526,90

54
00:02:26,495 --> 00:02:27,076
minus -

55
00:02:27,076 --> 00:02:27,656
minus -

56
00:02:27,656 --> 00:02:31,928
sa adaugi un numar negativ este acelasi lucru

57
00:02:31,928 --> 00:02:32,883
cu a scadea un numar pozitiv -

58
00:02:32,883 --> 00:02:35,267
minus 15,08

59
00:02:35,267 --> 00:02:37,200
- O sa scriu asta cu alta culoare -

60
00:02:37,200 --> 00:02:40,200
526,90

61
00:02:40,200 --> 00:02:43,956
minu 15,08.

62
00:02:43,956 --> 00:02:46,557
Sa vedem, zero este mai mic decat opt,

63
00:02:46,557 --> 00:02:48,972
facem din acesta un zece si imprumutam de la noua

64
00:02:48,972 --> 00:02:50,551
asa incat acesta devine 8 -

65
00:02:50,551 --> 00:02:51,619
sau as putea spune ca regrupam -

66
00:02:51,619 --> 00:02:54,173
Totul de aici este mai mare decat totul de acolo,

67
00:02:54,173 --> 00:02:56,356
deci zece minus opt e doi,

68
00:02:56,356 --> 00:02:58,445
opt minus zero e opt,

69
00:02:58,445 --> 00:02:59,421
si avem zecimalele.

70
00:02:59,421 --> 00:03:01,603
Sase minus cinci e unu,

71
00:03:01,603 --> 00:03:04,111
Doi minus unu e unu,

72
00:03:04,111 --> 00:03:06,067
si apoi ai cinci minus nimic.

73
00:03:06,067 --> 00:03:07,640
Deci a ramas

74
00:03:07,640 --> 00:03:10,733
cu 511 dolari si 82 de centi,

75
00:03:10,733 --> 99:59:59,999
dupa cel de-al doilea depozit.