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2014-10-04T13:43:33+03:00
3a+5b+4c+1= 3a+3b+2b+4c+1=3(a+b)+2(b+2c)+1=3x12+2x7+1=36+14+1=51




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  • Utilizator Brainly
2014-10-04T13:43:38+03:00
A+b=12 /*3
b+2c=7/*2
________________
3a+3b=36
2b+4c=14            +
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3a+5b+4c=50/ +1
3a+5b+4c+1=51
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