原式=(x-2)2=|x-2|,
∵x≤1,
∴原式=-(x-2)=-x+2.
故答案为-x+2.
填空
l. I want _____( go) to play football.
2. I know she's not _____( go) to get into trouble.
3. Why _____( not tell) him the fact?
4. —Let's go _____( shop).
—No,not today.
5. —Shall we_____( talk) about these cars?
—Sure.
6. I think the_____( cool) thing is that they trust me.
过给定的三个点画一段圆弧,第一点和第三点为圆孤的()第二点决定圆弧的位置和方向。