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a+b=32 b+c=45 calculati 2a+5b+3c

Răspuns :

2a+5b+3c=(2a+2b)+(3b+3c)=2(a+b)+3(b+c)=2·32+3·45=64+135=199
a+b=32 Ix2
b+c=45 Ix3

2a+2b=64
3b+3c=135
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2a+5b+3c=199