Symbol
Problem
$MATH5$ $-21-12$ $\left(\dfrac {2} {x}-5xy\right)^{12}$ $\square$ $\left(C2-221$ $\square$ $s$ A $2400$ $3y$ B $924000000y\leq$ C $52400000y^{5}$ |D $824000000y^{5}$