若分式(x²-x-2)/(x²+2x+1)的值为0,则x的值等于__________.计算:【(a+2)/(a²-2a)+(8)/(4-a²)】÷(a-2)/(a)
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若分式(x²-x-2)/(x²+2x+1)的值为0,则x的值等于__________.计算:【(a+2)/(a²-2a)+(8)/(4-a²)】÷(a-2)/(
若分式(x²-x-2)/(x²+2x+1)的值为0,则x的值等于__________.计算:【(a+2)/(a²-2a)+(8)/(4-a²)】÷(a-2)/(a)
若分式(x²-x-2)/(x²+2x+1)的值为0,则x的值等于__________.
计算:【(a+2)/(a²-2a)+(8)/(4-a²)】÷(a-2)/(a)
若分式(x²-x-2)/(x²+2x+1)的值为0,则x的值等于__________.计算:【(a+2)/(a²-2a)+(8)/(4-a²)】÷(a-2)/(a)
1、2
2、
原式=[(a+2)/a(a-2)-8/(a+2)(a-2)]×a/(a-2)
=[(a+2)²-8a]/(a+2)(a-2)×a/(a-2)
=(a-2)²/(a+2)(a-2)×a/(a-2)
=a/(a+2)
(x²-x-2)/(x²+2x+1)=0
则,(x²-x-2)=0且(x²+2x+1)≠0
(x+1)(x-2)=0且(x+1)²≠0
解得x=2
计算:
【(a+2)/(a²-2a)+(8)/(4-a²)】÷(a-2)/(a)
=[ (a+2)/a(a-2) - 8/(a+2)(...
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(x²-x-2)/(x²+2x+1)=0
则,(x²-x-2)=0且(x²+2x+1)≠0
(x+1)(x-2)=0且(x+1)²≠0
解得x=2
计算:
【(a+2)/(a²-2a)+(8)/(4-a²)】÷(a-2)/(a)
=[ (a+2)/a(a-2) - 8/(a+2)(a-2) ]× a/(a-2)
=(a-2)²/ [a(a+2)(a-2)] × a/(a-2)
=1/(a+2)
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