a²/a-1-(a+1) 公分母是a+1?还有x/x²-25-5/x²+10x+25,(b/a²-ab+a/b²-ab)/a-b/ab
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![a²/a-1-(a+1) 公分母是a+1?还有x/x²-25-5/x²+10x+25,(b/a²-ab+a/b²-ab)/a-b/ab](/uploads/image/z/1807852-4-2.jpg?t=a%26%23178%3B%2Fa-1-%EF%BC%88a%2B1%EF%BC%89+%E5%85%AC%E5%88%86%E6%AF%8D%E6%98%AFa%2B1%3F%E8%BF%98%E6%9C%89x%2Fx%26%23178%3B-25-5%2Fx%26%23178%3B%2B10x%2B25%2C%EF%BC%88b%2Fa%26%23178%3B-ab%2Ba%2Fb%26%23178%3B-ab%EF%BC%89%2Fa-b%2Fab)
a²/a-1-(a+1) 公分母是a+1?还有x/x²-25-5/x²+10x+25,(b/a²-ab+a/b²-ab)/a-b/ab
a²/a-1-(a+1) 公分母是a+1?还有x/x²-25-5/x²+10x+25,(b/a²-ab+a/b²-ab)/a-b/ab
a²/a-1-(a+1) 公分母是a+1?还有x/x²-25-5/x²+10x+25,(b/a²-ab+a/b²-ab)/a-b/ab
第一道,是a-1.左边的a+1只要认为它是a+1/1 然后分子分母同乘a-1
第二道是(x+5)²(x-5)
第三道是ab(1-a)(1-b)