1、-27m²n+9mn²-18mn2、ab+a+b+13、(x-1)(x-2)-2(2-x)²
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![1、-27m²n+9mn²-18mn2、ab+a+b+13、(x-1)(x-2)-2(2-x)²](/uploads/image/z/1631370-66-0.jpg?t=1%E3%80%81-27m%26sup2%3Bn%2B9mn%26sup2%3B-18mn2%E3%80%81ab%2Ba%2Bb%2B13%E3%80%81%EF%BC%88x-1%EF%BC%89%EF%BC%88x-2%EF%BC%89-2%EF%BC%882-x%EF%BC%89%26sup2%3B)
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