当x=________时,分式x²-4分之x²+5x-14的值为零

当x=________时,分式x²-4分之x²+5x-14的值为零
当x=________时,分式x²-4分之x²+5x-14的值为零

当x=________时,分式x²-4分之x²+5x-14的值为零
分式x²-4分之x²+5x-14的值为零
x²-4≠0 且x²+5x-14=0
x²-4≠0
x≠2或x≠-2
x²+5x-14=0
（x+7)(x-2)=0
x=-7 或x=2
综述x=-7

x²-4分之x²+5x-14=0
=>(x+7)(x-2)/(x+2)(x-2)=0
=>x=-7
当x=_-7_时,分式x²-4分之x²+5x-14的值为零