题目内容
已知a+b=
,ab=
,求a3b+2a2b2+ab3.
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∵a+b=
,ab=
,
∴a3b+2a2b2+ab3=ab(a2+2ab+b2)=ab(a+b)2=
×
=
.
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∴a3b+2a2b2+ab3=ab(a2+2ab+b2)=ab(a+b)2=
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