分解因式：x2+2x-3=______．
x2+2x-3=（x+3）（x-1）．
故答案为：（x+3）（x-1）．
Eddie is Millie's dog. _____ eyes are very big. [ ]
A. It's
B. Its
C. It
D. It is
下列关于实型常量书写正确的是( )。
A．E4
B．3.4e8
C．1.8E0.6
D．6e0.8
