原式
=-12a^5b^5c^5＋a^5b^5c^5
=-11a^5b^5c^5分开行不行看不懂-12a^5b^5c^5＋a^5b^5c^5？？？？-12a^5b^5c^5＋a^5b^5c^5=-12a^5 b^5c^5 ＋ a^5b^5c^5-12乘以a的5次方乘以b的5次方乘以c的5次方