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a+b+c=10 b+c =4 aflati a) ab+ac=? b)4a+6b+6c=? c)b,c stiind ca b-c=24 urgent dau coroana​

Răspuns :

Daria847ask

a+b+c=10

b+c=4 ( inlocuim in prima relatie)

a+4=10=>a=10-4=6

a) ab+ac= a( b+c)=6×4=24

b)4a+6b+6c=4a+6(b+c)=4×6+6×4=24+24=48

c)b+c=4

b-c=24

adunam cele 2 relatii si obtinem

2b=28=>b=28÷2=14

14+c=4=>c=4-14=-10

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