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\(\left(1-\dfrac{1}{2}\right)\times\left(1-\dfrac{1}{3}\right)\times\left(1-\dfrac{1}{4}\right)\times\left(1-\dfrac{1}{6}\right)\times\left(1-\dfrac{1}{6}\right)\)
\(=\dfrac{1}{2}\times\dfrac{2}{3}\times\dfrac{3}{4}\times\dfrac{4}{5}\times\dfrac{5}{6}\)
\(=\dfrac{1\times2\times3\times4\times5}{2\times3\times4\times5\times6}\)
\(=\dfrac{1}{6}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{4}-\frac{1}{5}\right):\left(\frac{1}{4}-\frac{1}{6}\right)\)
\(=\left(\frac{1}{2.3}+\frac{1}{4.5}\right):\frac{2}{4.6}\)
\(=\left(\frac{1}{6}+\frac{1}{20}\right).2.6\)
\(=\frac{13}{60}.2.6=\frac{13}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, (1 + 3 + 5 + 7+ ... + 2003 + 2005) x (125125 x 127 - 127127 x125)
= (1 + 3 + 5 +...+2003 + 2005) x (125 x 1001 x 127 - 127x1001 x 125)
= (1 + 3 + 5 +...+ 2003 + 2005) x 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 3/8 x 14/53 x 8/3
=3/8x8/3x14/53
= 1 x 14/53
=14/53
b) 9/17x1/5+9/17x4/5
=9/17x(1/5+4/5)
=9/17x 5/5
=9/17x1
= 9/17
Li-ke cho mik nhé!
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1a) \(\frac{49}{84}-\frac{24}{84}+\frac{7}{84}\)
\(=\frac{8}{21}\)
2b)\(=\frac{72}{99}-\left(\frac{28}{99}+\frac{14}{99}\right)\)
\(=\frac{72}{99}-\frac{42}{99}\)
=\(\frac{30}{99}=\frac{10}{33}\)
c) = 83,45 - ( 30,98 + 42,47 )
= 83,45 - 73,45
= 10
mình làm được rồi đấy nhớ k cho mình nhe
7/12-2/7+1/12
=49/84-24/84+7/84
=73/84-7/84
=66/84=22/28
2.
a)72/99-28/99-14/99
=72/99-(28/99+14/99)
=72/99-42/99
=30/99=10/33
83,45-30,98-42,47
=83,45-(30,98+42,47)
=83,45-73,45
=10
\(\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right).\left(1-\frac{1}{5}\right)\)
\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}\)
\(=\frac{1}{3}.\frac{3}{4}.\frac{4}{5}\)
\(=\frac{1}{3}.\frac{3}{5}\)
\(=\frac{1}{5}\)
ủng hộ tớ nha
mk ko biết xin lỗi bạn nha!!!
mk ko biết xin lỗi bạn nha!!!
mk ko biết xin lỗi bạn nha!!!
mk ko biết xin lỗi bạn nha!!!