a) 15a(a+в)/55b(a+в)=15a/55в=3a/11в
b) y^3+y/y^2=y(y^2+1)/y^2=y^2+1/y
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a) 15a(a+в)/55b(a+в)=15a/55в=3a/11в
b) y^3+y/y^2=y(y^2+1)/y^2=y^2+1/y