问题
解答题
（1）计算：-22+（
（2）先化简，再求值：
|
答案
（1）-22+（
）0+2sin30°1
-12
=-4+1+2×1 2
=-4+1+1
=-2；
（2）
+x2-1 x2-2x+1
÷xx2-2x x-2
=
+1x+1 x-1
=
．2x x-1
搜题请搜索小程序“爱下问搜题”
（1）计算：-22+（
（2）先化简，再求值：
|
（1）-22+（
）0+2sin30°1
-12
=-4+1+2×1 2
=-4+1+1
=-2；
（2）
+x2-1 x2-2x+1
÷xx2-2x x-2
=
+1x+1 x-1
=
．2x x-1
| 完型填空 | ||||
| I'm Dingding. I 1 from Beijing. I have(有) four 2 . They 3 _ Hellen, Sally, Michael and David. Hellen and Michael are 4 the U.S.A. They are both(两者都) thirteen 5 old. They are 6 Class One, Grade Eight. Sally 7 from England. She is thirteen, 8 . She is in 9 . David is from Canada. He and I are the same age(年龄). We are fourteen. We are in Class Two, Grade Nine. We are in 10 same school. | ||||
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