某厂的产值若每年平均比上一年增长10%,经过x年后,可以增长到原来的2倍,在求x时,所列的方程正确的是( )
A:(1+10%)x-1=2
B:(1+10%)x='2'
C:(1+10%)x+1=2
D:x=(1+10%)2
用配方法解方程x2+4x+1=0时,经过配方,得到( )
ZhouYang can't thank her parents ______much because without their help she _____have won the first place in the Winter Olympic Games.