This is Mike's bedroom. You can see a desk and a bed in the room. On the desk, there is a backpack and three books. One is a Chinese book, the other two are English books. There is a clock on the desk, too. You can see a baseball under the desk. On the bed there is a box. Can you guess what's in the box? Ah, it's a new computer game. It's the present(礼物) for Mike's seventh birthday.

下列加线实词解释错误的一项是：（   ）

—Hurray! Actually these competitors were all strong, but our students made it.

如图，二次函数y=ax²+bx+c的图象交x轴于A、B两点，下列结论：

①abc＞0；②2a+b=0；③当m≠1时，a+b＞am²+bm；④a﹣b+c＞0；⑤若ax₁²+bx₁=ax₂²+bx₂，且x₁≠x₂，则x₁+x₂=2；⑥OA•OB=$\frac{c}{a}$；

其中正确的有（　　）