Question

[(xy-2)^2-2x^y^2-4]^2÷（-xy)其中X=10,y=-1/25

Answer 1

[(xy-2)^2-2x^y^2-4]^2÷（-xy)

=[-x^2y^2-4xy-4]^2÷(-xy)

=(xy+2)^4/(-xy),

X=10,y=-1/25时xy=-2/5,

原式=（8/5）^4/(2/5)=2048/125.