若4x^ay+x^2y^b=-3x^2y
问题描述:
若4x^ay+x^2y^b=-3x^2y
4x^ay+x^2y^b=-3x^2y
a+b=?
答
-4x^ay+x^2y^b=3x^2y 得-4x^ay+x^2y^b+3x^2y =0,
x^2y{[-4x^(a-2)]+y^(b-1)+3}=0,a=2,b=1.a+b=3