①5x³(-2x²y)②-3x²(-x²y+2y-1)③a²(a-1)+2a(a²-2a+3)
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![①5x³(-2x²y)②-3x²(-x²y+2y-1)③a²(a-1)+2a(a²-2a+3)](/uploads/image/z/1790460-36-0.jpg?t=%E2%91%A05x%26%23179%3B%EF%BC%88-2x%26%23178%3By%EF%BC%89%E2%91%A1-3x%26%23178%3B%EF%BC%88-x%26%23178%3By%2B2y-1%EF%BC%89%E2%91%A2a%26%23178%3B%EF%BC%88a-1%EF%BC%89%2B2a%EF%BC%88a%26%23178%3B-2a%2B3%EF%BC%89)
①5x³(-2x²y)②-3x²(-x²y+2y-1)③a²(a-1)+2a(a²-2a+3)
①5x³(-2x²y)②-3x²(-x²y+2y-1)③a²(a-1)+2a(a²-2a+3)
①5x³(-2x²y)②-3x²(-x²y+2y-1)③a²(a-1)+2a(a²-2a+3)
①5x³(-2x²y)
=-10(x^5)y
②-3x²(-x²y+2y-1)
=3(x^4)y-6x²y+3x²
③a²(a-1)+2a(a²-2a+3)
=a³-a²+2a³-4a²+6a
=3a³-5a²+6a