分解因式:①1/2a²b²+2+2ab②x³-4x③6(x-y)-9-(x-y)²④m²-2mn+n²-16
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![分解因式:①1/2a²b²+2+2ab②x³-4x③6(x-y)-9-(x-y)²④m²-2mn+n²-16](/uploads/image/z/3000980-20-0.jpg?t=%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%EF%BC%9A%E2%91%A01%2F2a%26%23178%3Bb%26%23178%3B%2B2%2B2ab%E2%91%A1x%26%23179%3B-4x%E2%91%A26%28x-y%29-9-%28x-y%29%26%23178%3B%E2%91%A3m%26%23178%3B-2mn%2Bn%26%23178%3B-16)
分解因式:①1/2a²b²+2+2ab②x³-4x③6(x-y)-9-(x-y)²④m²-2mn+n²-16
分解因式:①1/2a²b²+2+2ab②x³-4x③6(x-y)-9-(x-y)²④m²-2mn+n²-16
分解因式:①1/2a²b²+2+2ab②x³-4x③6(x-y)-9-(x-y)²④m²-2mn+n²-16
①1/2a²b²+2+2ab
=1/2(a²b²+4+4ab)
=1/2(ab+2)²
②x³-4x
=x(x²-4)
=x(x+2)(x-2)
③6(x-y)-9-(x-y)²
=-[(x-y)²-6(x-y)+9]
= -(x-y-3)²
④m²-2mn+n²-16
=(m-n)²-16
=(m-n+4)(m-n-4)