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\(a.=\dfrac{2019}{2020}\times\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)\\ =\dfrac{2019}{2020}\times1=\dfrac{2019}{2020}\\ b.=\dfrac{25}{27}\times\left(\dfrac{17}{14}-\dfrac{1}{14}-\dfrac{2}{14}\right)\\ =\dfrac{25}{27}\times1=\dfrac{25}{27}\)
\(27\times14-27\times4=27\times\left(14-4\right)\)
\(=27\times10=270\)
27 x 14 - 27 x 4
= 27 x ( 14 -4 )
= 27 x 10
= 270
=
\(32\times27+47\times73+27\times15\)
\(=\left(32\times27+27\times15\right)+47\times73\)
\(=27\times\left(32+15\right)+47\times73\)
\(=27\times47+47\times73\)
\(=47\times\left(27+73\right)\)
\(=47\times100\)
\(=4700\)
Học tốt
\(=32\cdot27+27\cdot15+47\cdot73\)
\(=27\cdot\left(32+15\right)+47\cdot73\)
\(=27\cdot47+47\cdot73\)
\(=47\cdot\left(27+73\right)\)
\(=47\cdot100\)
\(=4700\)
\(x-\frac{8}{27}=\frac{7}{27}\)
\(x\in\left(-\infty;\infty\right)\)
\(\frac{27x-8}{27}=\frac{7}{27}\Rightarrow\left(27x-8\right)27=27.7\)
\(\frac{\left(27x-8\right)27}{27}=\frac{27.7}{27}\)
\(27x-8=\frac{27.7}{27}\)
Rút gọn :
\(x=\frac{5}{9}\)
\(a,123\times54+27\times123-12\times123+123\times31\)
\(=123\times\left(54+27-12+31\right)\)
\(=123\times100\)
\(=12300\)
\(b,\dfrac{121}{27}\times\dfrac{54}{11}< n< \dfrac{100}{21}:\dfrac{25}{126}\)
\(22< n< \dfrac{100}{21}\times\dfrac{126}{25}\)
\(22< n< 24\)
Vì \(23>22\) và \(23< 24\) nên \(n=23\)
a123x54+27x123-12x123+123x31
=123:54+27:123-12:123+123:31
=6642+27:123-12:123+123:31
=6642+3321-12:123+123:31
=6642+3321-1476+123:31
=6642+3321-1476+3813
=12300
b,121/27x54/11<n>100/21:25/126
=22<n>24
n=23
4960 * 27 = 133920
TL
133920
TK cho m
HT