(1)先化简再求值.a/a+2÷(a+2),其中a=3..原式=a/(a+2)²,当a=3时.原式=3/25 (2)化简求值.x-1/x ²-2x+1÷1/x ²-1,其中x=根号2-1
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![(1)先化简再求值.a/a+2÷(a+2),其中a=3..原式=a/(a+2)²,当a=3时.原式=3/25 (2)化简求值.x-1/x ²-2x+1÷1/x ²-1,其中x=根号2-1](/uploads/image/z/3003326-62-6.jpg?t=%EF%BC%881%EF%BC%89%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC.a%2Fa%2B2%C3%B7%28a%2B2%29%2C%E5%85%B6%E4%B8%ADa%3D3..%E5%8E%9F%E5%BC%8F%3Da%2F%EF%BC%88a%2B2%29%26%23178%3B%2C%E5%BD%93a%3D3%E6%97%B6.%E5%8E%9F%E5%BC%8F%3D3%2F25+%EF%BC%882%EF%BC%89%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC.x-1%2Fx+%26%23178%3B-2x%2B1%C3%B71%2Fx+%26%23178%3B-1%2C%E5%85%B6%E4%B8%ADx%3D%E6%A0%B9%E5%8F%B72-1)
(1)先化简再求值.a/a+2÷(a+2),其中a=3..原式=a/(a+2)²,当a=3时.原式=3/25 (2)化简求值.x-1/x ²-2x+1÷1/x ²-1,其中x=根号2-1
(1)先化简再求值.a/a+2÷(a+2),其中a=3..原式=a/(a+2)²,当a=3时.原式=3/25 (2)化简求值.x-1/x ²-2x+1÷1/x ²-1,其中x=根号2-1
(1)先化简再求值.a/a+2÷(a+2),其中a=3..原式=a/(a+2)²,当a=3时.原式=3/25 (2)化简求值.x-1/x ²-2x+1÷1/x ²-1,其中x=根号2-1
先把式子化简 然后再带入求值