①a²+b²/a-b+2ab/b-a ②a/b-1+2a/1-b-3a/1-b 要详细过程
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![①a²+b²/a-b+2ab/b-a ②a/b-1+2a/1-b-3a/1-b 要详细过程](/uploads/image/z/5127744-48-4.jpg?t=%E2%91%A0a%26%23178%3B%2Bb%26%23178%3B%2Fa-b%2B2ab%2Fb-a+%E2%91%A1a%2Fb-1%2B2a%2F1-b-3a%2F1-b+%E8%A6%81%E8%AF%A6%E7%BB%86%E8%BF%87%E7%A8%8B)
①a²+b²/a-b+2ab/b-a ②a/b-1+2a/1-b-3a/1-b 要详细过程
①a²+b²/a-b+2ab/b-a ②a/b-1+2a/1-b-3a/1-b 要详细过程
①a²+b²/a-b+2ab/b-a ②a/b-1+2a/1-b-3a/1-b 要详细过程
①
a²+b²/a-b+2ab/b-a
=a²+b²/a-b-2ab/a-b
=(a²+b²-2ab)/a-b
=(a-b)²/a-b
=a-b
②a/b-1+2a/1-b-3a/1-b
=a/b-1-2a/b-1+3a/b-1
=(a -2a +3a)/(b-1)
=2a/(b-1)