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
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)
数学人气:748 ℃时间:2020-01-28 16:23:32
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