Đáp án:
$1) \frac{x}{y}=\frac{2}{3}\\
2)
\frac{x}{y}=\frac{2}{3}\\$
Giải thích các bước giải:
$1) \frac{0,075}{y}.(56x+16y)=4\\
\Leftrightarrow \frac{0,075.56x}{y}+\frac{0,075.16y}{y}=4\\
\Leftrightarrow \frac{21x}{5y}+\frac{6}{5}=4\\
\Leftrightarrow \frac{21x}{5y}=4-\frac{6}{5}\\
\Leftrightarrow \frac{21x}{5y}=\frac{14}{5}\\
\Leftrightarrow \frac{x}{y}=\frac{14}{5}.\frac{5}{21}=\frac{2}{3}\\
2)
\frac{0,36x}{y}.56=13,44\\
\Leftrightarrow \frac{0,36x.56}{y}=13,44\\
\Leftrightarrow \frac{504x}{25y}=\frac{336}{25}\\
\Leftrightarrow \frac{x}{y}=\frac{336}{25}.\frac{25}{504}=\frac{2}{3}\\$