> 数学 >
已经a+b=1,ab=-3,求2a³b+2ab³
人气:293 ℃ 时间:2020-06-26 07:46:30
解答

2a³b+2ab³
=2ab(a²+b²)
=2ab[(a+b)²-2ab]
=2×(-3)[1²-2×(-3)]
=-6(1+6)
=-6×7
=-42
推荐
猜你喜欢
© 2026 79432.Com All Rights Reserved.
电脑版|手机版