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Dacă 3a+2b+4c=494
b+2c=160
Calculați a×b+2×a×c

Răspuns :

Cartea78
3a+2b+4c=494
b+2c=160
2b+4c=494-3a
2(b+2c)=494-3a
2*160=494-3a
320=494-3a
3a=494-320
3a=174
a=174:3
a=58
a*b+2*a*c=a(b+2c)=58*160=9280
Elakissup3bs9j
B=160-2c
3a+2(160-2c)+4c=494
3a+320-4c+4c=494
3a=494-320
3a=174
A=174:3
A=58
C=0
B=160
Axb+2xaxc=58x160+2x58x0=9280

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