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daca 6a + 9b=45 si 10b+15c=60,afla 2a+ 5b+3c TE ROGGGG

Răspuns :

Ramonanyka

6a+9b=45

3*(2a+3b)=45

2a+3b=45:3

2a+3b=15

10b+15c=60

5*(2b+3c)=60

2b+3c=60:5

2b+3c=12

2a+5b+3c=(2a+3b)+(2b+3c)=15+12=27

Wolfin

6a + 9b = 45

10b + 15c = 60

2a +5b + 3c= ?

6a + 9b = 45 /:3

2a + 3b = 15

10b + 15c = 60 /:5

2b + 3c = 12

2a + 3b + 2b + 3c ?

15 + 12 = 27

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