(1)(a/b)-(b/a)-(a²+b²)/ab,其中a²+ab-2b²=0(2)计算2x/(x²-4y²)+2/(2y-x)+1
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![(1)(a/b)-(b/a)-(a²+b²)/ab,其中a²+ab-2b²=0(2)计算2x/(x²-4y²)+2/(2y-x)+1](/uploads/image/z/7135188-60-8.jpg?t=%EF%BC%881%EF%BC%89%EF%BC%88a%2Fb%EF%BC%89-%EF%BC%88b%2Fa%29-%EF%BC%88a%26%23178%3B%2Bb%26%23178%3B%EF%BC%89%2Fab%2C%E5%85%B6%E4%B8%ADa%26%23178%3B%2Bab-2b%26%23178%3B%3D0%EF%BC%882%EF%BC%89%E8%AE%A1%E7%AE%972x%2F%EF%BC%88x%26%23178%3B-4y%26%23178%3B%EF%BC%89%2B2%2F%EF%BC%882y-x%29%2B1)
(1)(a/b)-(b/a)-(a²+b²)/ab,其中a²+ab-2b²=0(2)计算2x/(x²-4y²)+2/(2y-x)+1
(1)(a/b)-(b/a)-(a²+b²)/ab,其中a²+ab-2b²=0
(2)计算2x/(x²-4y²)+2/(2y-x)+1
(1)(a/b)-(b/a)-(a²+b²)/ab,其中a²+ab-2b²=0(2)计算2x/(x²-4y²)+2/(2y-x)+1
(1)化简得原式=-2b*b/ab
后面十字相乘法(a-b)(a+2b)=0,则a=b或a+2b=0
代入原式,结果为-2或1
(2)原式=[2x+2(-2y-x)]/(x2-4y2) +1=-4y/(x2-4y2)