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用换元法解方程x2+8x+,若设y=,则原方程可化为A.y2+y+12=0B.y2+y-2...
试题详情
用换元法解方程x
2+8x+
,若设y=
,则原方程可化为( )
A.y
2+y+12=0
B.y
2+y-23=0
C.y
2+y-12=0
D.y
2+y-34=0
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