Decomposition factor: 2a2b-a3-ab2

2a2b-a3-ab2, = - A (a2-2ab + B2), = - A (a-b) 2

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1. Decomposition factor A ^ 3 + AB ^ 2-2a ^ 2B,
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3. If we know / A / = 5, B = 3 and ab < 0, we can find the value of a + B
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