A:CH3CH2CHBrCH2Br
B:CH3CH(CH2Br)2
C:CH3CHBrCHBrCH3
D:(CH3)2CBrCH2Br
He has an big egg.
设函数f(x)=g(x)+x2,曲线y=g(x)在点(1,g(1))处的切线方程为y=2x+1,则曲线y=f(x)在点(1,f(1))处的切线的斜率为( )
求下列每组数的最大公因数.
18和24____
20和25____