2/19+31/38+11/19+5/19
$\left(1.5x-0.5y\right)^{2}-\left(0.5x-1.5y\right)^{2}$
5/6 * 12/19
how much is x²-2xy+3y² less than 2x²-3y²+xy
2579
5/3 + 3/5
5/6 x 12/19
a+7=13
$\left(3r-2t\right)^{2}-25\left(r+t\right)^{2}$
$\left(5t+2\right)^{2}-\left(5t-2\right)^{2}$
