已知x+2y=5,xy=1.则2x2y+4xy2=_.
问题描述:
已知x+2y=5,xy=1.则2x2y+4xy2=______.
答
∵x+2y=5,xy=1,
∴2x2y+4xy2=2xy(x+2y)=2×1×5=10,
故答案为:10.