`21/14=33/x`
`=>21*x=33*14`
`=>21x=462`
`=>x=462:21`
`=>x=22`
2114=33x2114=33�
⇒21⋅x=33⋅14⇒21⋅�=33⋅14
⇒21x=462⇒21�=462
⇒x=462:21⇒�=462:21
⇒x=22⇒�=22
2114=33x2114=33�
⇒21⋅x=33⋅14⇒21⋅�=33⋅14
⇒21x=462⇒21�=462
⇒x=462:21⇒�=462:21
⇒x=22⇒�=22
`21/14=33/x`
`=>21*x=33*14`
`=>21x=462`
`=>x=462:21`
`=>x=22`
2114=33x2114=33�
⇒21⋅x=33⋅14⇒21⋅�=33⋅14
⇒21x=462⇒21�=462
⇒x=462:21⇒�=462:21
⇒x=22⇒�=22
2114=33x2114=33�
⇒21⋅x=33⋅14⇒21⋅�=33⋅14
⇒21x=462⇒21�=462
⇒x=462:21⇒�=462:21
⇒x=22⇒�=22
\(\dfrac{x-17}{33}\)+\(\dfrac{x-21}{29}_{ }\)+\(\dfrac{x}{25}\)=4
Tìm x,y,z biết
\(\dfrac{10}{x-5}=\dfrac{6}{y-9}=\dfrac{14}{z-21}\) và xyz= 6720
Thực hiện phép tính (bằng cách hợp lý nếu có thể)
a) \(1\dfrac{4}{23}+\dfrac{5}{21}-\dfrac{4}{23}+0,5+\dfrac{16}{21}\)
b) \(\dfrac{3}{7}.19\dfrac{1}{3}-\dfrac{3}{7}.33\dfrac{1}{3}\)
c) \(9.\left(-\dfrac{1}{3}\right)^3+\dfrac{1}{3}\)
d) \(15\dfrac{1}{4}:\left(-\dfrac{5}{7}\right)-25\dfrac{1}{4}\left(-\dfrac{5}{7}\right)\)
\(C=\dfrac{3}{14}:\dfrac{1}{28}-\dfrac{13}{21}:\dfrac{1}{28}-\dfrac{29}{42}:\dfrac{1}{28}-8\)
\(\text{c) \dfrac{3}{14} : \dfrac{1}{28} - \dfrac{13}{21} : \dfrac{1}{28} - \dfrac{29}{42} : \dfrac{1}{28} - 8}\)
\(\sqrt{\dfrac{49}{36}}.\dfrac{3}{14}-\left|\dfrac{-4}{7}\right|:\dfrac{8}{21}+\left(\dfrac{2020}{2021}\right)^0\)
Chọn câu trả lời đúng \(\left(2x+\dfrac{1}{5}\right)\left(-\dfrac{3}{5}x+\dfrac{4}{7}\right)=0\) thì:
A. x = \(\dfrac{-1}{10}\) hoặc x = \(\dfrac{20}{21}\)
B. x = \(\dfrac{20}{21}\)
C. x = \(-\dfrac{1}{10}\)
D. x = \(-\dfrac{20}{21}\)
Giúp mình với!
\(\dfrac{\text{14^{333}x 21^{666}x 35^{999}}}{\text{10^{333}x 15^{666}x 7^{1998}}}\)
tìm x biết
\(\dfrac{x-2023}{6}\)\(+\dfrac{x-2023}{10}\)\(+\dfrac{x-2023}{15}\)\(+\dfrac{x-2023}{21}\)=\(\dfrac{8}{21}\)