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(2002•宜昌)用换元发解方程-6=0,令y=代入原方程后,变形正确的为A.y2+5=0...
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(2002•宜昌)用换元发解方程
-6
=0,令y=
代入原方程后,变形正确的为( )
A.y
2+5=0
B.y
2-6y=0
C.(y+1)(y+5)=0
D.(y-1)(y-5)=0
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