1、5x^4+3x^2y-10-3x^2y+x^4-1=6x^4-11+3x^2y-3x^2y=05x^4+x^4=6x^4-10-1=-112、p^2+3pq+6-8p^2+pq（注意,题目中这里的a应该是q吧?）=-7p^2+4pq+6p^2-8p^2=-7p^2 +3pq+pq=4pq就是这样了,还不清楚的话,HI...