当你想知道别人去哪儿里时,你问:
A:Is that far from here?
B:Where are you going?
C:Do you have a map?
方程x2=9的根是( )
先化简,再求值:(x+1)2+x(x﹣2),其中x=3
2.2x=4-1.8x
x=____