a²-5a＝7.求（a-1）（2a-1）-（a+1）²-3的值.若实数a满足a²-2a+1＝0.则2a²-4a+5＝______0.2^2009×5^2010＝______

a²-5a＝7.求（a-1）（2a-1）-（a+1）²-3的值.若实数a满足a²-2a+1＝0.则2a²-4a+5＝______0.2^2009×5^2010＝______
a²-5a＝7.求（a-1）（2a-1）-（a+1）²-3的值.
若实数a满足a²-2a+1＝0.则2a²-4a+5＝______
0.2^2009×5^2010＝______

a²-5a＝7.求（a-1）（2a-1）-（a+1）²-3的值.若实数a满足a²-2a+1＝0.则2a²-4a+5＝______0.2^2009×5^2010＝______
若实数a满足a²-2a+1＝0.则2a²-4a+5＝3.
0.2^2009×5^2010＝5