Question

Punctele C,D,E si F pls ca dau coronita

Answer 1

$\displaystyle\bf\\c)~\frac{2}{7} = \frac{6,5}{2x-5} \Leftrightarrow \frac{65}{10}\cdot 7=4x-10 \Leftrightarrow \frac{13\cdot7}{2} =4x-10=,~inmultim~ambii~membri~cu~2.\\91=8x-20 \Leftrightarrow 8x=111 \implies x = \frac{111}{8}.\\d)~\frac{3x-1}{4} = \frac{0,5}{3} \Leftrightarrow \frac{1}{2} 4 = 9x-3 \Leftrightarrow 2=9x-3 \Leftrightarrow 9x=5\implies x = \frac{5}{9}.\\e)~\frac{5}{4} =\frac{1}{2x+0,5} \Leftrightarrow 10x+\frac{5}{2} =4 \Leftrightarrow 10x=\frac{8-5}{2} =\frac{3}{2} \implies x = \frac{3}{20}.$$\displaystyle\bf\\ f)~\frac{1}{6}=\frac{0,3+x}{4}\Leftrightarrow 6(0,3+x)=4 \Leftrightarrow \frac{9}{5} +6x=4 \Leftrightarrow 6x=4-\frac{9}{5} \Leftrightarrow 6x=\frac{11}{5}\implies x=\frac{11}{30}.$