945/3600
3x -7=4x+8
5 $a^{2}$ - ab - 2 $b^{2}$
-10
2.7_0.19
$x^{2}$ - $x$ - 12
3×-2×-5×6
$\sqrt{\frac{9^{3}}{25}}$
30÷1/3×3=
375/6250
