1.当x为何值时,分式x²-4/x²-x-2无意义?2.当x为何值时,分式x+1/x²+2x-3的值为零?3.化简求值,3ab-a³b+a²b³/a²+2ab+b²÷a²-ab/a²-b²,其中:a=根号5+1,b+根号5-1
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![1.当x为何值时,分式x²-4/x²-x-2无意义?2.当x为何值时,分式x+1/x²+2x-3的值为零?3.化简求值,3ab-a³b+a²b³/a²+2ab+b²÷a²-ab/a²-b²,其中:a=根号5+1,b+根号5-1](/uploads/image/z/5440790-38-0.jpg?t=1.%E5%BD%93x%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E5%88%86%E5%BC%8Fx%26%23178%3B-4%2Fx%26%23178%3B-x-2%E6%97%A0%E6%84%8F%E4%B9%89%3F2.%E5%BD%93x%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E5%88%86%E5%BC%8Fx%2B1%2Fx%26%23178%3B%2B2x-3%E7%9A%84%E5%80%BC%E4%B8%BA%E9%9B%B6%3F3.%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%2C3ab-a%26%23179%3Bb%2Ba%26%23178%3Bb%26%23179%3B%2Fa%26%23178%3B%2B2ab%2Bb%26%23178%3B%C3%B7a%26%23178%3B-ab%2Fa%26%23178%3B-b%26%23178%3B%2C%E5%85%B6%E4%B8%AD%EF%BC%9Aa%3D%E6%A0%B9%E5%8F%B75%2B1%2Cb%2B%E6%A0%B9%E5%8F%B75-1)
1.当x为何值时,分式x²-4/x²-x-2无意义?2.当x为何值时,分式x+1/x²+2x-3的值为零?3.化简求值,3ab-a³b+a²b³/a²+2ab+b²÷a²-ab/a²-b²,其中:a=根号5+1,b+根号5-1
1.当x为何值时,分式x²-4/x²-x-2无意义?
2.当x为何值时,分式x+1/x²+2x-3的值为零?
3.化简求值,3ab-a³b+a²b³/a²+2ab+b²÷a²-ab/a²-b²,其中:a=根号5+1,b+根号5-1
1.当x为何值时,分式x²-4/x²-x-2无意义?2.当x为何值时,分式x+1/x²+2x-3的值为零?3.化简求值,3ab-a³b+a²b³/a²+2ab+b²÷a²-ab/a²-b²,其中:a=根号5+1,b+根号5-1
1.由原式得:(x+2)(x-2)/(x+1)(x-2)=x+2/X+1,当x+1等于0时,原式无意义.所以当x=-1时,原式无意义 .
2.由原式得:(x+1)/(x+3)(x-1)=0,所以当x=1或-3时,原式无意义.
3.原式=3ab-a³b+b³+2ab+b²/a²-ab/(a+b)(a-b)
=……
我靠,你确定第三题题目没打错?
(1)x=0时
(2)x=1时
(3)公式不清楚,有除号,又有分号,还是间隔号