a-b=3 ab=-3 则3a-3b-6ab

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a-b=3 ab=-3 则3a-3b-6ab
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a-b=3 ab=-3 则3a-3b-6ab
a-b=3 ab=-3 则3a-3b-6ab

a-b=3 ab=-3 则3a-3b-6ab

3a-3b-6ab
=3(a-b-2ab)
=3×(3+6)
=3×9
=27
注:a-b-2ab=3-2×(-3)=3-(-6)=3+6=9

25,

=3(a-b)-6ab
=27

27

27

27