1.约分(1)5x / 25x^2 (2)9ab^2+6abc / 3a^2b (3)9a^2+6ab+b^2 / 3a+b (4)x^2-36 / 2x+12
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![1.约分(1)5x / 25x^2 (2)9ab^2+6abc / 3a^2b (3)9a^2+6ab+b^2 / 3a+b (4)x^2-36 / 2x+12](/uploads/image/z/1685384-8-4.jpg?t=1.%E7%BA%A6%E5%88%86%EF%BC%881%EF%BC%895x+%2F+25x%5E2+++++++++++++++++%282%299ab%5E2%2B6abc+%2F+3a%5E2b+++++++++++++++%283%299a%5E2%2B6ab%2Bb%5E2+%2F+3a%2Bb++++++%284%29x%5E2-36+%2F+2x%2B12)
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1.约分(1)5x / 25x^2 (2)9ab^2+6abc / 3a^2b (3)9a^2+6ab+b^2 / 3a+b (4)x^2-36 / 2x+12
1.约分(1)5x / 25x^2 (2)9ab^2+6abc / 3a^2b (3)9a^2+6ab+b^2 / 3a+b (4)x^2-36 / 2x+12
1.约分(1)5x / 25x^2 (2)9ab^2+6abc / 3a^2b (3)9a^2+6ab+b^2 / 3a+b (4)x^2-36 / 2x+12
1.约分(1)5x / 25x^2
=-1/5x
(2)9ab^2+6abc / 3a^2b
=3ab(3b+2c)/3a²b
=(3b+2c)/a
(3)9a^2+6ab+b^2 / 3a+b
=(3a+b)²/(3a+b)
=3a+b
(4)x^2-36 / 2x+12
=(x+6)(x-6)/2(x+6)
=(x-6)/2
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