1.

%Wt(०5५३)

Answer»

(5x/y + y/5x)^3 =(5x/y)^3+(y/5x)^3+3(5x/y)(y/5 )(5x/y + y/5x) =(125/y^3)+(y^3/125)+3(0)(5x/y+y/5x)= =(125/y^3 + y^3/125)



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