1.（-5/3ab^3c)*3/10a^3bc*(-8abc)^2
=(-5/3) a^1 b^3 c^1 * (3/10) a^3 b^1 c^1 * (64)a^2 b^2 c^2
=-32a^6b^6c^4
2.（a^2+3）(a-2)-a(a^2-2a-2)
=(a^3-2a^2+3a-6)-(a^3-2a^2-2a)
=a^3-2a^2+3a-6-a^3+2a^2+2a
=5a-6
=-5-6
=-11
3.-8ax^2+16axy-8ay^2
=-8a(x^2-2xy+y^2)
=-8a(x-y)"^2
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这是最佳答案!