Question

rezolvati in Q ecuatiile de la ex 5 pct c); d); g).
multumesc!

Answer 1

$5.c)\frac{3}{4}x-2=7/*4\\ 3x-8=28/+8\\ 3x=36=>x=12.\\ \\ d)-2\frac{1}{2}x=x+5\frac{1}{4}\\ -\frac{5}{2}x=x+\frac{21}{4}/*4\\ -10x=4x+21/-4x\\ -14x=21=>x=-\frac{21}{14}=-\frac{3}{2}.\\ \\ g)0,08(3)=\frac{1}{12};0,8(3)=\frac{5}{6}\\ \\ 0,08(3)x-2=9-0,8(3)x\\ \frac{1}{12}x-2=9-\frac{5}{6}x/*12\\x-24=108-10x/+10x+24\\ 11x=132=>x=\frac{132}{11}=12.$

/rfd