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- 1梯形面积=（上底+下低）X高除以2.想问下为什么要除以2了?
- 2巧妙计算：1/55+2/55+3/55+…+10/55-11/155-12/155-13/155-…-20/155
- 3It was the best of times, it was the worst of times.
- 4she is _dinner? 1:cook 2:cooking
- 5Can you tell me what is the relation between you and the owner?
- 6甲乙两辆汽车向北行驶,甲车比乙车快,以什么为参照物两辆车向南运动
- 7一个高5厘米的圆柱，如果它的高增加3厘米，它的表面积就增加18.84平方厘米，原来圆柱的体积是多少立方厘米？
- 8已知等腰三角形的腰长为10cm 面积为25平方cm 那么顶角度数为多少?
- 9疑字的部首是什么
- 10Jane waited all day for Jenny to ___2___ back the dollar she borrowed还钱是pay back还是return back