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\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}\)
\(=\frac{42}{17}.\frac{68}{63}\)
\(=\frac{8}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}:\dfrac{4}{3}=\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}\times\dfrac{3}{4}=\dfrac{462}{187}\times\dfrac{204}{252}=\dfrac{42}{17}\times\dfrac{17}{21}=\dfrac{2}{1}=2\)
21/11 x 22/17 x 68/63 : 4/3
=( 21/11 x 22/17) x (68/63 : 4/3)
= 42/17 x 17/21
= 2/1 = 2
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![](https://rs.olm.vn/images/avt/0.png?1311)
cái này là 2 phép tính riêng biệt hay là gì hả bạn ?
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{21}{11}\)x \(\frac{22}{17}\)x\(\frac{68}{63}\)
= \(\frac{42}{17}\)x\(\frac{68}{63}\)
= \(\frac{8}{3}\)
18 - x : 2 = 16
x : 2 = 18 - 16
x = 2 x 2
x = 4
\(\frac{21}{11}\times\frac{22}{17}\times\frac{68}{63}\)
\(=\frac{21}{11}\times\frac{22\times68}{17\times63}\)
\(=\frac{21}{11}\times\frac{22\times4}{1\times63}\)
\(=\frac{21}{11}\times\frac{88}{63}\)
\(=\frac{21\times88}{11\times63}\)
\(=\frac{1\times8}{1\times3}\)
\(=\frac{8}{3}\)
\(18-x:2=16\)
\(x:2=18-16\)
\(x:2=2\)
\(x=2\times2\)
\(x=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{21}{11}X\frac{22}{17}X\frac{68}{63}=\frac{952}{357} \)
\(\frac{5}{14}X\frac{7}{13}X\frac{6}{25}=\frac{3}{65}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
21/11 x 22/17x68/63
= 7x3x2x11x4x17 / 11x17x7x3x3
=8/3
5/14x7/13x26/25
=5x7x26 / 14x13x25
= 5x7x13x2 / 7x2x13x5x5
=1/5
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21/11 x 22/27 x 68/63 x 126/21=816/81
học tốt