Đáp án:
Giải thích các bước giải:
a) $\frac{6}{2x}+1=\frac{2}{7}\\\Leftrightarrow \frac{6}{2x}=\frac{2}{7}-1=-\frac{5}{7}\\\Leftrightarrow \frac{6}{2}\times \frac{1}{x}=-\frac{5}{7}\\\Leftrightarrow \frac{1}{x}=-\frac{5}{7}\div \frac{6}{2}\\\Leftrightarrow \frac{1}{x}=-\frac{5}{21}\\\Leftrightarrow x=1\div (-\frac{5}{21})=-\frac{21}{5}$
b) $\frac{24}{7x}-3=-\frac{4}{25}\\\Leftrighatrrow \frac{24}{7x}=\frac{71}{25}\\\Leftrightarrow \frac{1}{x}=\frac{497}{600}\\\Leftrightarrow x=\frac{600}{497}$
c) $\frac{4}{x}-6=-\frac{12}{18}\\\Leftrightarrow \frac{4}{x}=\frac{16}{3}\\\frac{y}{24}=-\frac{12}{18}\\\Leftrightarrow y=-\frac{12}{18}\times 4\\\Leftrightarrow y=-16$
