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Daca a+b=33 si a + c=11,calculati 5xa + 3xb +2xc

Răspuns :

5xa+3xb+2xc=3xa+3xb+2xa+2xc=3(a+b)+2(a+c)=3x33+2x11=99+22=121
descompui pe 5a in 3a+2a si tot asa apo scoti factor comun
deci 3a+2a+3b+2c=3(a+b)+2(a+c)= 3x33+2x11= si aici calculezi Bafta