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X : 27 = 15 ( dư 14 )
X = 15 x 27 + 14
X = 405 + 14
X = 419
x:27=15(dư14)
x:27=27x15
x:27=405
x=405+14
x=419
Bui Thi Mai Huong
k mik nha!
\(a.=\dfrac{2019}{2020}\times\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)\\ =\dfrac{2019}{2020}\times1=\dfrac{2019}{2020}\\ b.=\dfrac{25}{27}\times\left(\dfrac{17}{14}-\dfrac{1}{14}-\dfrac{2}{14}\right)\\ =\dfrac{25}{27}\times1=\dfrac{25}{27}\)
\(27\times14-27\times4=27\times\left(14-4\right)\)
\(=27\times10=270\)
27 x 14 - 27 x 4
= 27 x ( 14 -4 )
= 27 x 10
= 270
=
5/8 + x : 4/14 = 27/14
=> x : 4/14 = 27/14 - 5/8
=> x : 4/14 = 73/56
=> x = 73/56 x 4/14
=> x = 73/196
( 12 x 13 + 14 x 15 + ... + 24 x 25 + 26 x 27 ) x ( 14 + 6 - 10 + 5 - 3 x 5 )
= ( 12 x 13 + 14 x 15 + ... + 24 x 25 + 26 x 27 ) x 0
= 0
`16/27xx13/29+16/27xx14/29`
`=16/27xx(13/29+14/29)`
`=16/27xx27/29`
`=16/29`
`48/49+15/39-18/49+15/39`
`=(48/49-18/49)+(15/39+15/39)`
`=30/49+30/39`
`=880/637`
\(\dfrac{5}{13}\) \(\times\) \(\dfrac{9}{14}\) \(\times\) \(\dfrac{28}{27}\) \(\times\) \(\dfrac{26}{35}\)
= \(\dfrac{5}{13}\) \(\times\) \(\dfrac{9}{14}\) \(\times\) \(\dfrac{14\times2}{9\times3}\) \(\times\) \(\dfrac{13\times2}{5\times7}\)
= \(\dfrac{5\times9\times14\times13}{5\times9\times14\times13}\) \(\times\) \(\dfrac{2\times2}{3\times7}\)
= 1 \(\times\) \(\dfrac{4}{21}\)
= \(\dfrac{4}{21}\)
X x 24= 5704 - 832
X x 24 =4872
X = 4872 : 24
X =203
X = 415x45 + 27
X =18702 tick cho mình
x :27 = ? dư 14 ?
x : 27 dư 14\(\Rightarrow\)x - 14\(⋮\)27\(\Rightarrow\)x - 14 \(\in\)B( 27 )
B( 27 ) = { 0 ; 27; 54;81;...}
Những giá trị của x là : 13;40;67