化简下列各式:
(1)5x4+3x2y-10-3x2+x-1; (2)p²+3pq+6-8p²+pq ;
(3)(7y-3z)-(8y-5z);
(4)-(a5-6b)-(-7+3b)
(5)2(2a²+9b)+3(-5a²-4b);
(6)-3(2x²-xy)+4(x²+xy-6).
(1)6x4-11
(2)-7p2+4pq+6
(3)-y+2z
(4)-a5+3b+7
(5)-11a2+6b
(6)-2x2+7xy-24