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a +b+c=156 c=b+10 ax2+bx3+cx4 a , b, c+=?

Răspuns :

a+b+c=156
c=b+10

2a+3b+4c=488
2a+2b+2c=312
scadem=>
b+2c=488-312=176
b+2(b+10)=176
3b=176-20
3b=156
b=52

c=52+10=62

a=156-52-62
a=42