求值: (1)已知ab²=6,求ab(a²b⁵-ab³-b)的值; (2)3(3a...
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发布时间：2024-09-28 23:22
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时间：2024-10-20 19:27
=-ab²(a²b^4-ab²-1)
=6(6^2+6-1)
=6*31
=186
a=1，b=-1/2，ab=-1/2
2(3a^2+2ab-b^2)*(-ab)-3a^2(ab-b^2)
=-2ab(3a^2+2ab-b^2)-3aab(a-b)
=3a^2+2ab-b^2+3a/2(a-b)
=3a^2-1-b^2+3a^2/2-3ab/2
=9a^2/2-b^2-1/4
=9/2-1/4-1/4
=9/2-1/2
=4
