把多项式:x5-(-4x4y+5xy4)-6(-x3y2+x2y3)+(-3y5)去括号后按字母x的降幂排列为_.
问题描述:
把多项式:x5-(-4x4y+5xy4)-6(-x3y2+x2y3)+(-3y5)去括号后按字母x的降幂排列为______.
答
x5-(-4x4y+5xy4)-6(-x3y2+x2y3)+(-3y5)
=x5+4x4y-5xy4+6x3y2-6x2y3-3y5
=x5+4x4y+6x3y2-6x2y3-5xy4-3y5.