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5a+3b+2c=? a+b=33 a+c=11

Răspuns :

Alitta
5a+3b+2c = 3a+3b+2a+2c=3(a+b)+2(a+c)=3*33 + 2*11=99+22=121
Mazda
5a+3b+2c=? a+b=33 a+c=11a=33-b
c=11-a

5a+3b+2c= 5(33-b)+3b+2(11-a)= 165-5b+3b+22-2a=187-2b-2a ; 187-2(33-a)-2a= 187-66+2a-2a= 187-66=121

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