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Daca a+b+c=180 si a+2×c=130 calculați 4×a+2×b+6×c

Răspuns :

Răspuns:

Explicație pas cu pas:

a + b + c = 180

a  +  2 × c = 130

____________ adun sumele

2 × a + b + 3 × c = 310  l  × 2

_____________________

4 × a + 2 × b + 6 × c = 2 × 310

4 × a + 2 × b + 6 × c = 620


a + b + c = 180

a + 2 × c = 130

a + b + c + a + 2 × c =

2 × a + b + 3 × c = 180 + 130

2 × a + b + 3 × c = 310 | × 2

4 × a + 2 × b + 6 × c = 620