先化简,再求值:(x-1分之x²-3)÷x-1分之1,其中x满足x²-2x-3=0.
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先化简,再求值:(x-1分之x²-3)÷x-1分之1,其中x满足x²-2x-3=0.
先化简,再求值:(x-1分之x²-3)÷x-1分之1,其中x满足x²-2x-3=0.
先化简,再求值:(x-1分之x²-3)÷x-1分之1,其中x满足x²-2x-3=0.
x²-2x-3=0
(x+1)(x-3)=0
x=-1或x=3
当x=-1时
(x-1)分之(x²-3)÷(x-1)分之1
=(x-1)分之(x²-3)×(x-1)
=x²-3
=(-1)²-3
=1-3
=-2
当x=3时
(x-1)分之(x²-3)÷(x-1)分之1
=(x-1)分之(x²-3)×(x-1)
=x²-3
=3²-3
=9-3
=6
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