Simplify the following:
$\frac{1}{r}\cdot\frac{1}{m}$1r·1m
Simplify the following: $\frac{-3x}{7}\cdot\frac{12y}{7}$−3x7·12y7
Simplify the following:
$\frac{7x}{6}\cdot\frac{5y}{2}$7x6·5y2
Simplify the expression:
$\frac{x^2}{5}\cdot\frac{15}{x}$x25·15x