Rút gọn phận thức: 2a^2 -2ab / ac +ad -bc -bd

* Hướng dẫn giải

$\frac{2{\mathrm{a}}^2-2\mathrm{ab}}{\mathrm{ac}+\mathrm{ad}-\mathrm{bc}-\mathrm{bd}}=\frac{2\mathrm{a}\left(\mathrm{a}-\mathrm{b}\right)}{\left(\mathrm{a}-\mathrm{b}\right)\left(\mathrm{c}+\mathrm{d}\right)}=\frac{2\mathrm{a}}{\mathrm{c}+\mathrm{d}}$