已知a-b=5,ab=6求3a2b-6ab2+18b+6

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已知a-b=5,ab=6求3a2b-6ab2+18b+6

已知a-b=5,ab=6求3a2b-6ab2+18b+6
已知a-b=5,ab=6求3a2b-6ab2+18b+6

已知a-b=5,ab=6求3a2b-6ab2+18b+6
a-b=5,ab=6
3a²b-6ab²+18b+6
=3ab(a-2b)+18b+6
=3×6(a-2b)+18b+6
=18(a-2b)+18b+6
=18a-36b+18b+6
=18(a-b)+6
=18×5+6
=96

3a^2b-6ab^2+18b+6
=3a*ab-6b*ab+18b+6
=3a*6-6b*6+18b+6
=18a-36b+18b+6
=18a-18b+6
=18(a-b)+6
=18*5+6
=96