Question

Afla : a=?, b=?, c=? stiind ca 11a+2b+c=4030 ; a+b=690 ; b+c=1040 clasa a 4a

Answer 1

Sper sa te ajute si sa intelegi!

Answer 2

11a+2b+c=4030
a+b=690
b+c=1040
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a=?;b=?;c=?

11a+2b+c-((a+b)+(b+c))=4030-(690+1040)
11a+2b+c-(a+2b+c)=4030-1730
10a=2300
a=2300:10
a=230

a+b=690
230+b=690
b=690-230
b=460

b+c=1040
460+c=1040
c=1040-460
c=580

11a+2b+c=4030
11*230+2*460+580=4030
2530+920+580=4030
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R=>a=230.. .=>11a=2530
       b=460... =>2b=920
       c=580....=>1c=580

2530+920+580=4030