-3/3.15/13-3/7.11/13-3/7
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11 tháng 2 2022
\(\dfrac{14\times9}{21\times3}=\dfrac{2\times7\times3\times3}{3\times7\times3}=2.\\ \dfrac{15\times26\times8}{45\times13\times16}=\dfrac{3\times5\times2\times13\times2\times2\times2}{5\times3\times3\times13\times2\times2\times2\times2}=\dfrac{1}{3}.\)
11 tháng 2 2022
a: \(=\dfrac{126}{63}=2\)
b: \(=\dfrac{15\cdot16\cdot13}{15\cdot3\cdot13\cdot16}=\dfrac{1}{3}\)
7 tháng 5 2018
\(\frac{3}{7}\left(\frac{7}{13}-\frac{3}{7}\right)-\frac{7}{13}\left(-\frac{3}{7}+\frac{26}{49}\right)\)
\(=\frac{3}{7}\left(\frac{49}{91}-\frac{39}{91}\right)-\frac{7}{13}\left(-\frac{21}{49}+\frac{26}{49}\right)\)
\(=\frac{3}{7}.\frac{10}{91}-\frac{7}{13}.\frac{5}{49}\)
\(=\frac{30}{637}-\frac{5}{91}=\frac{30}{637}-\frac{35}{637}=\frac{-5}{637}\)
`-3/3*15/13-3/7*11/13-3/7`
`-1*15/13-3/7*11/13-3/7`
`=-3/7:3/7*15/13-3/7*11/13-3/7`
`=-3/7*35/13-3/7*11/13-3/7`
`=-(3/7*35/13+3/7*11/13+3/7)`
`=-3/7(35/13+11/13+1)`
`=-3/7*59/13`
`=-177/91`
−3/3∗15/13−3/7∗11/13−3/7−3/3∗15/13−3/7∗11/13−3/7
−1∗15/13−3/7∗11/13−3/7−1∗15/13−3/7∗11/13−3/7
=−3/7:3/7∗15/13−3/7∗11/13−3/7=−3/7:3/7∗15/13−3/7∗11/13−3/7
=−3/7∗35/13−3/7∗11/13−3/7=−3/7∗35/13−3/7∗11/13−3/7
=−(3/7∗35/13+3/7∗11/13+3/7)=−(3/7∗35/13+3/7∗11/13+3/7)
=−3/7(35/13+11/13+1)=−3/7(35/13+11/13+1)
=−3/7∗59/13=−3/7∗59/13
=−177/91=−177/91