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Probleme la mate! HElP varutu meu

 
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lizuca

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Post Posted: 07-04-2010, 12:18:38 | Translate post to: ... (Click for more languages)

am si eu cateva probleme..3 probleme:D
Ma ajutati:D?

1. Daca la 1/5 dintr-un numar A adaug 3,obtin 1/4 din A.Care este numarul a?

2.Mergand de acasa spre scoala,Adrian se gandeste "Am parcurs 2/5 din drum,adica cu 255 m mai putin decat 1/2 din drum"
Care este lungimea drumuluipe care trebuie sa-l parcurga Adrian de acasa pana la scoala?

3. Dupa ce a parcurs 45 m si inca 2/3 din lungimea drumului dintre casa si magazin,Mihai constata ca mai are de parcurs 1/6 din drum si inca 15 m.
Cati metri a parcurs Mihai pana acum?
Care este lungimea drumului sau?


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Reyes

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Post Posted: 07-04-2010, 13:29:04 | Translate post to: ... (Click for more languages)

1. Daca la 1/5 dintr-un numar A adaug 3,obtin 1/4 din A.Care este numarul a?


Code:
3+A/5=A/4
A/4-A/5=3 (amplifici cu 5,4,20)
5A-4A=60
A=60



2.Mergand de acasa spre scoala,Adrian se gandeste "Am parcurs 2/5 din drum,adica cu 255 m mai putin decat 1/2 din drum"
Care este lungimea drumuluipe care trebuie sa-l parcurga Adrian de acasa pana la scoala?
Code:

2A/5=A/2-255 (amplifici cu 2,5,10)
4A-5A=-2550
-A=-2550 |*(-1)
A=2550




3. Dupa ce a parcurs 45 m si inca 2/3 din lungimea drumului dintre casa si magazin,Mihai constata ca mai are de parcurs 1/6 din drum si inca 15 m.
a)Cati metri a parcurs Mihai pana acum?
b)Care este lungimea drumului sau?

Code:
b)
45+2A/3+A/6+15=A
2A/3+A/6-A=-60 (amplifici cu 2,1,6,6)
4A+A-6A=-360
-A=-360 |*(-1)
A=360

a)
2/3*360 = 240
45+240=285



Sper ca nu m-a batut matematica -




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pateu

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Post Posted: 18-04-2010, 15:49:34 | Translate post to: ... (Click for more languages)

Voi n'aveti ce face zau -

 
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