Question

daca ax( b+5)=336 si axb=301,CALCULEAZA PE a
daca cx(3+d)=140 si cxd=125,CALCULEAZA PE c

Answer 1

[tex]a\cdot( b+5)=336\\a\cdot b=301\leftrightarrow b=\frac{301}{a}\\\\ a\cdot( b+5)=336\leftrightarrow ab+5a=336\leftrightarrow 301+5a=336\leftrightarrow 5a=35\\\leftrightarrow a=7\\b=301:7=43[/tex]

$c\cdot(3+d)=140\\c\cdot d=125\leftrightarrow d=\frac{125}{c}\\ c\cdot(3+d)=140\leftrightarrow 3c+c\cdot d=140\leftrightarrow 3c+125=140\leftrightarrow3c=140-125\\\leftrightarrow3c=15\leftrightarrow c=15:3=5\\d=\frac{125}{5}=25$