B .
C .
x2﹣7=0
D . x5﹣
x2=0
=6y-9,是方程的有( )
①3x+8,②5x+2=8,③x2+1=5,④9=3×3,⑤
=8.
B .
C .
D .
B .
C .
D .
B .
C . 3+7=10
D . x²+2x+1=0
B .
C .
D .