Question

1)Cinci sarituri ale unui ogar si 7 ake unei vulpi masoara impreuna 17m.
Doua sarituri ale unui ogar si 5 sarituri ale unei vulpi masoara impreuna 9m.Ce distanta parcurge fiecare dupa 60 de sarituri.
2)Treizeci kg de lamai si 45 kg de mere costa 360 de lei.Stiind ca 6 kg de lamai costa tot cat 9 kg mere,sa se afle cat costa un kg de lamai si cat costa 1 kg de mere?

Answer 1

5o+7v=17 I x2

2o+5v=9 I x5 si le scad(metoda reducerii)

25v-14v= 45-34

11v=11

v=1 m

o=9-5  :  2 =2 m

verific: 5*2+7=17 ok

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Deci dupa 60 sarituri avem

pt ogar: 60x2=120 m

pt vulpe: 60x1=60 m.

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30l+45m=360

6l=9m si inlocuim in prima ecuatie

5x9m + 45m = 360

90m=360

m=4

l=9m/6=3m/2=3x4/2 = 6

Verificare: 6x6 = 9x4 =36, corect.

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30l+45m=360

6l=9m si inlocuim in prima ecuatie

5x9m + 45m = 360

90m=360

m=4

l=9m/6=3m/2=3x4/2 = 6

Verificare: 6x6 = 9x4 =36, corect.