∵x+y=4,
∴(x+y)2=16,
∴x2+y2+2xy=16,
而x2+y2=14,
∴xy=1,
∴x3y-2x2y2+xy3
=xy(x2-2xy+y2)
=14-2
=12.
已知x+y=4,x2+y2=14,求x3y-2x2y2+xy3的值.
已知x+y=4,x2+y2=14,求x3y-2x2y2+xy3的值.
数学人气:192 ℃时间:2020-02-02 16:55:11
优质解答
我来回答
类似推荐
猜你喜欢
- 1英语翻译 爱上
- 2把一个圆柱沿高展开,他的侧面是边长1分米的正方形,这个圆柱的表面积是多少平方分米
- 3She was upset becarse Chris took her picture while she was curling her hair.
- 4场景描写是什么意思
- 5一辆汽车,每小时行65千米,T小时可行( )千米,行s千米需要( )小时
- 6sin(π+A)=二分之一;,那么cos(二分之三π-A)等于多少
- 7look,sandy is eating very quickly.Maybe she is h ___
- 8燃料燃烧的能量主要以什么形式散失掉
- 9请帮我以“My favourite book”为题写篇英语作文
- 10根据句意和首字母完成单词.1、She can speak English,but only a l___.