\frac{1}{x}+ \frac{1}{( \frac{5x}{3}= \frac{2}{5}} \frac{1}{x}+ \frac{3}{5x}}=0,4 | *5x5+3=2x2x=8x=4Ответ: 4
\frac{2}{( \frac{8x}{5})}+ \frac{1}{x}= \frac{3}{4} \frac{2}{0,4x}+ \frac{0,4}{0,4x}= \frac{0,3x}{0,4x} \frac{2+0,4-0,3x}{0,4x}=0 \frac{2,4-0,3x}{0,4x}=024-3x=0x=8
Ответ:8
\frac{2}{\frac{4x}{3}}- \frac{1}{x}= \frac{1}{4} \frac{2*3}{1*4x}- \frac{1}{x}= \frac{1}{4} \frac{6-4-x}{4x}=0x=2Ответ:2