3a²-ab+6ab-2b²=?
问题描述:
3a²-ab+6ab-2b²=?
答
3a²-ab+6ab-2b²=3a²+5ab-2b²=(3a-b)(a+2b)怎么变成3a²+5ab-2b²-ab+6ab=(-1+6)ab=5ab
3a²-ab+6ab-2b²=?
3a²-ab+6ab-2b²=3a²+5ab-2b²=(3a-b)(a+2b)怎么变成3a²+5ab-2b²-ab+6ab=(-1+6)ab=5ab