已知ab=2,a+b=5,求a³b+2a²b²+ab³的值.
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已知ab=2,a+b=5,求a³b+2a²b²+ab³的值.
已知ab=2,a+b=5,求a³b+2a²b²+ab³的值.
已知ab=2,a+b=5,求a³b+2a²b²+ab³的值.
a³b+2a²b²+ab³ = ab (a^2+2ab+b^2) =ab(a+b)^2 =2 * 25 =50
a³b+2a²b²+ab³
=ab(a²+2ab+b²)
=ab(a+b)²
=2*25
=50