1/2+1/6+1/18+1/54+1/162+1/486是怎么计算的
1/2+1/6+1/18+1/54+1/162+1/486是怎么计算的
数学人气:918 ℃时间:2020-01-28 06:44:22
优质解答
就是一个等比数列求和,如果你是高中生就直接用公式算,如果你是小学生,就用下方法:令 1/2+1/6+1/18+1/54+1/162+1/486=s—————(*)等式两边同时乘以“公比”1/3,得到 1/6+1/18+1/54+1/162+1/486+1/1458=1/3s——...
我来回答
类似推荐
猜你喜欢
- 1This film is very good.怎么改感叹句?急.快.
- 2若实数x,y满足x2+y2-2x+4y=0,则x-2y的最大值为_.
- 3同义句转换We saw a film called Harry Porter yesterday. We saw a film ( )the( )( )Harry Porter
- 4鲁滨孙漂流记梗概来写作文 (至少400字)好的我多加分
- 5every man and woman( )interested in the sport.A has B is C are D have 选哪个为什么选他
- 6My father used to do some housework.= My father _____ _____ some housework.英语练习题,
- 71,We intend to go to India,even if the fares______again between now and next summer.
- 8Kg是斤还是公斤呢
- 9已知:如图,在直角梯形ABCD中,AD∥BC,∠ABC=90°.点E是DC的中点,过点E作DC的垂线交AB于点P,交CB的延长线于点M.点F在线段ME上,且满足CF=AD,MF=MA. (1)若∠MFC=120°,求证:AM=2MB; (2
- 10人体呼气时胸腔内的气压、肺内的气压以及外界的气压由大道小的顺序是什么?