1+1=?
I don'n kown help me
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Mỗi người mỗi tên , mỗi sở thích khác nhau mà bạn :>
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1/ My sister speak english as well as me
2/ It's different from learn English
3/The stomache makes Mr. Thanh can't enjoy the meal (không chắc mấy)
4/ how old is Mrs Mai's daughter
26 tháng 2 2018
câu 1: my sister don't speak english as well
câu 2: it's different for learning english
câu 3: the stomachache canbe mr.thanh couldn't enjoy the meal
câu 4: how old is your daughter, mrs mai
IM
8 tháng 9 2016
Ta có
\(\frac{1}{1.2}+\frac{1}{3.4}+....+\frac{1}{49.50}\)
\(=1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+....+\frac{1}{49}-\frac{1}{50}\)
\(=\left(1+\frac{1}{2}+\frac{1}{3}+....+\frac{1}{50}\right)-2\left(\frac{1}{2}+\frac{1}{4}+.....+\frac{1}{50}\right)\)
\(=\left(1+\frac{1}{2}+\frac{1}{3}+....+\frac{1}{50}\right)-\left(1+\frac{1}{2}+\frac{1}{3}+....+\frac{1}{25}\right)\)
\(=\frac{1}{26}+\frac{1}{27}+....+\frac{1}{50}\)
=> \(\frac{1}{1.2}+\frac{1}{3.4}+....+\frac{1}{49.50}\)\(=\frac{1}{26}+\frac{1}{27}+....+\frac{1}{50}\)
1+1=?
two
.................
khó quá