Question

( begin{array}{c}frac{b a^{2} x^{3}+2 a^{2} y^{2} b c+b^{3} y^{2}+a^{3} x^{2} y+2 b^{2} x^{2} a y+a b^{2} y^{3}}{(a x+b y)^{2}} =frac{a^{3} x^{2} y+2 a y^{2} y^{2} b x+a b^{2} y^{3}+b a^{2} x^{3} y+2 b^{2} y^{2} a y+b^{3} x y^{2}}{(a x+b y)^{2}} & =a yleft(a^{2} x^{2}+2 a x b y+b y^{2}right)+b xleft(a^{2} x^{2}+2 b x a yright. (a x+b y)^{2} & left.+b^{2} y^{2}right)end{array} )
( =frac{(a y+b x)(a x+b y)^{2}}{(a+n+h y)^{2}} )
an rating
( =a y+b x )
(B) 扑

# The expression bx(aºx? + 2a’y2 +bºy?) + ay(a?x? + 2b x2 +b?y23 by2 is equal to (ax + by)? (A) a(x + y) (B) bx + ay (C) ax + by (D) b(x + y)

Solution