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先化简,再求值a^2-b^2/a^2-ab除(a+2ab+b^2/a),其中a=-1/2,b=-1
人气:204 ℃ 时间:2020-04-14 10:58:57
解答
(a²-b²)/(a²-ab)÷(a²+2ab+b²)/a
=[(a+b)(a-b)]/[a(a-b)]÷(a+b)²/a
=(a+b)/a×a/(a+b)²
=1/(a+b)
=1/[(-1/2)+(-1)]
=1/(-3/2)
=-2/3
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