题有错吧.因该是+2y^4吧
x^4- y^4+3xy^2-xy^2-5x^2y+3x^2y+2y^4
=x^4+ y^4+2xy^2-2x^2y
=50-2*(-14)
=78
x^4+y^4=50 x^2y-xy^2=-14 求代数式x^4- y^4+3xy^2-xy^2-5x^2y+3x^2y-2y^4的值
x^4+y^4=50 x^2y-xy^2=-14 求代数式x^4- y^4+3xy^2-xy^2-5x^2y+3x^2y-2y^4的值
数学人气:127 ℃时间:2019-08-19 14:57:59
优质解答
我来回答
类似推荐
猜你喜欢
- 1解释句子中加括号的词语
- 2三国演义的好词好句好段读书笔记
- 3以“读名著”为话题写一篇不少于800字的记叙文
- 4利用烧杯、水、小铁块、细线和弹簧测力计测定小铁块的密度 请简要写出实验步骤,并用字母表示所测出的物
- 5我要英语短文 介绍自己 写一篇文章
- 6英语翻译
- 7cos^2-sin^2x+2sinxcosx为什么等于cos2x-sin2x
- 8绝缘油水分单位PPM与mg/L如何换算
- 9It was raining hard when I got home last night.
- 10would you like to come to my birthday party next Sunday?I 'd love to,_ i can't