1.\(\dfrac{8}{11}+\dfrac{8}{33}\times\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{8\times3}{33\times4}=\dfrac{8\times12}{11\times12}+\dfrac{8\times3}{33\times4}=\dfrac{8\times15}{132}=\dfrac{120}{132}=\dfrac{10}{11}\)
2.\(\dfrac{7}{9}\times\dfrac{3}{14}:\dfrac{5}{8}=\dfrac{7}{9}\times\dfrac{3}{14}\times\dfrac{8}{5}=\dfrac{4}{15}\)
3.\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}=\dfrac{5}{12}-\dfrac{7}{32}\times\dfrac{16}{21}=\dfrac{5}{12}-\dfrac{1}{6}=\dfrac{5-2}{12}=\dfrac{3}{12}=\dfrac{1}{4}\)
`@V.Tr.V`
`8/11+8/33xx3/4=8/11+2/11=10/11`
`7/9xx3/14:5/8=7/9xx3/14xx8/5=[7xx3xx4xx2]/[3xx3xx7xx2xx5]=4/[3xx5]=4/15`
`5/12-7/32:21/16=5/12-7/32xx16/21=5/12-2/12=3/12=1/4`
8/11 + 8/33 x 3/4 = 8/11 + 2/11 = 10/11
7/9 x 3/14 : 5/8 = 1/6 : 5/8 = 4/15
5/12 - 7/32 : 21/16 = 5/12 - 1/6 = 1/4
Cái câu đầu 1. là câu 1 hay là \(\text{1}\dfrac{\text{8}}{\text{11}}\) vậy cậu?
1-------------
8/11 + 8/33 x 3/4
= 8/11 + 2/11
= 10/11
2-------------
7/9 x 3/14 : 5/8
= 1/6 : 5/8
= 4/15
3----------
5/12 - 7/32 : 21/16
= 5/12 - 1/6
= 1/4
