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1 tháng 10 2018
Ta có: 2x-1 = 16
=> 2x-1 = 24 (do 16 = 24)
=> x-1 = 4
=> x = 5
Vậy x = 5
PP
8
14 tháng 6 2016
C không là nguyên tố cụng không phải hợp số cũng không bằng 1 nên C bằng 0
S
22 tháng 10 2016
\(S=\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{2010.2011}\)
\(S=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{2010}-\frac{1}{2011}\)
\(S=1-\frac{1}{2011}\)
\(S=\frac{2010}{2011}\)
C
3
C
4 tháng 10 2016
\(50+60+40+50+50+45\)
\(=\left(50+50\right)+\left(60+40\right)+\left(45+55\right)\)
\(=100+100+100\)
\(=100.3\)
\(=300\)
the lun
PS
1
19 tháng 11 2017
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30 tháng 4 2015
Bạn nhấn vào \(fx\) trên thanh, xoá hết các phần có sẵn sau đó nhấn vào \(\frac{ }{ }\)
tương lai đúng không
còn nữa là : khi nào chết