1/2x^a-1y4-b與多項(xiàng)式3x^3y+2x^2y^2的和是二項(xiàng)式
當(dāng)1/2x^a-1y^4-b與3x^3y是同類項(xiàng)時(shí),
a-1=3,4-b=1
則,a=4,b=3
a+b=4+3=7
當(dāng)1/2x^a-1y^4-b與2x^2y^2是同類項(xiàng)時(shí),
a-1=2,4-b=2
則,a=3,b=2
a+b=3+2=5