约分①-15(a+b)²/-25(a+b)②x²y+xy²/2xy ③m²-3m/9-m² 要过程.
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![约分①-15(a+b)²/-25(a+b)②x²y+xy²/2xy ③m²-3m/9-m² 要过程.](/uploads/image/z/2678438-38-8.jpg?t=%E7%BA%A6%E5%88%86%E2%91%A0-15%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B%EF%BC%8F-25%EF%BC%88a%2Bb%EF%BC%89%E2%91%A1x%26%23178%3By%2Bxy%26%23178%3B%EF%BC%8F2xy+%E2%91%A2m%26%23178%3B-3m%EF%BC%8F9-m%26%23178%3B+%E8%A6%81%E8%BF%87%E7%A8%8B.)
约分①-15(a+b)²/-25(a+b)②x²y+xy²/2xy ③m²-3m/9-m² 要过程.
约分①-15(a+b)²/-25(a+b)②x²y+xy²/2xy ③m²-3m/9-m² 要过程.
约分①-15(a+b)²/-25(a+b)②x²y+xy²/2xy ③m²-3m/9-m² 要过程.
①-15(a+b)²/-25(a+b)
=3(a+b)/5
②x²y+xy²/2xy
=xy(x+y)/2xy
=(x+y)/x
③m²-3m/9-m²
=m(m-3)/(3-m)(3+m)
=-m/(m+3)
3(a+b)/5
X+Y/2
-M/M+3