【xy(x²-3y)+3xy²】(-2xy)+x³y²(2x-y)
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![【xy(x²-3y)+3xy²】(-2xy)+x³y²(2x-y)](/uploads/image/z/1333288-64-8.jpg?t=%E3%80%90xy%28x%26%23178%3B-3y%29%2B3xy%26%23178%3B%E3%80%91%28-2xy%29%2Bx%26%23179%3By%26%23178%3B%282x-y%29)
【xy(x²-3y)+3xy²】(-2xy)+x³y²(2x-y)
【xy(x²-3y)+3xy²】(-2xy)+x³y²(2x-y)
【xy(x²-3y)+3xy²】(-2xy)+x³y²(2x-y)
【xy(x²-3y)+3xy²】(-2xy)+x³y²(2x-y)
=(x³y-3xy²+3xy²)×(-2xy)+2x的4次方y²-x³y³
=-2x的4次方y²)+2x的4次方y²-x³y³
=-x³y³