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- 2数列an的前n项和为Sn=n∨²求a8等于多少?
- 3The later I sleep,The later I will go to work tomorrow.“正确吗?”
- 4如图,△ABC中,∠A=40度,AB=AC,D为△ABC内一点,且∠DCA=∠DBC,求∠BDC的度数.
- 5Progress so far has been very good.We are,_____,confident that the work will be completed on time.
- 6求函数f(x)=2x-3+根号4x-13 的值域
- 7This box is too heavy for me to carry it upstairs._____.A、 You may ask for help B、 I'll give you a hand C、 P
- 8当2N的水平拉力将水平桌面上的物体匀速拉动,若拉力改为4N,物体受到的摩擦力为多少?
- 9某化合物完全燃烧,需要4.8克氧气,同时只生成4.4克CO2和2.7克水该化合物含有几种元素
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