Question

daca a+b=12 si b+c=4,atunci calculati valoarea expresiei:2a+6b+4c.
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Answer 1

(a+b)=12
2*(a+b)=2*12
2a+2b=24(1)
b+c=4
4*(b+c)=4*4
4b+4c=16(2)
Din (1)+(2)
2a+6b+4c=40

Answer 2

2a+2b=24

4b+4c=16     =>total=2a+6b+4c=40