x + 529 = 54 x 11
d) 12 x 156 - 12 x 55 - 12
e) 12 x 11 + 21 x 11 + 11 x 33
g) 132 x 11 - 11 x 32 - 54 x 11
d) 12x 156 - 12 x 55 - 12
= 12 x ( 156 - 55 - 12 )
= 12 x 100
= 1200
e ) 12 x 11 + 21 x 11 + 11 x 33
= ( 12+ 21 + 33) x 12
= 66 x 11
= 726
g) 132 x 11 - 11 x 32 - 54 x 11
= ( 132 - 32 - 54 ) x 11
= 46 x 11
= 506
d) 12 x 156 - 12 x 55 - 12 = 12x(156 - 55 - 1 ) = 12 x 100 = 1200
e) 12 x 11 + 21 x 11 + 11 x 33 = 11 x ( 12 + 21 + 33 ) = 11 x 66 = 726
g) 132 x 11 - 11 x 32 - 54 x 11 = 11 x ( 132 - 32 - 54 ) = 11 x 46 = 506
d) \(12\times156-12\times55-12\) \(=12\times\left(156-55-1\right)\)
\(=12\times100=1200\)
e) \(12\times11+21\times11+11\times33\)\(=11\times\left(12+21+33\right)=11\times66=726\)
g) \(132\times11-11\times32-54\times11\) \(=11\times\left(132-32-54\right)=11\times46=506\)
X x 23-X x 11-X x 3=54
=>23x-11x-3x=54
=>9x=54
hay x=6
4 x 389017- 5 x 529 -3 x 1000+14
1.Tìm các số thực a, b, c biết:
\(\frac{5x^2-2}{x^3-3x-2}=\frac{a}{x-2}+\frac{b}{x+1}+\frac{c}{\left(x+1\right)^2}\)
2.giải các phương trình sau:
a) \(\frac{x+3}{35}+\frac{x+3}{45}+\frac{x+3}{54}=0\)
b)\(\frac{2x-1}{85}+\frac{2x-1}{58}=\frac{2x-1}{62}\)
c)\(\frac{x=1}{100}+\frac{x+2}{99}+\frac{x+3}{98}=-3\)
d)\(\frac{x+13}{2010}+\frac{x+12}{2011}=\frac{x+11}{2012}+\frac{x+10}{2013}\)
e)\(\frac{845-x}{345}+\frac{771-x}{271}=\frac{687-x}{187}+\frac{529-x}{29}\)
a)TÍNH BẰNG CÁCH THUẬN TIỆN
123 x 54 + 27 x 123 - 12 x 123 + 123 x 31
b)TÌM n
121/27 x 54/11 < n < 100/21 : 25/126
\(a,123\times54+27\times123-12\times123+123\times31\)
\(=123\times\left(54+27-12+31\right)\)
\(=123\times100\)
\(=12300\)
\(b,\dfrac{121}{27}\times\dfrac{54}{11}< n< \dfrac{100}{21}:\dfrac{25}{126}\)
\(22< n< \dfrac{100}{21}\times\dfrac{126}{25}\)
\(22< n< 24\)
Vì \(23>22\) và \(23< 24\) nên \(n=23\)
a)TÍNH BẰNG CÁCH THUẬN TIỆN
123 x 54 + 27 x 123 - 12 x 123 + 123 x 31
b)TÌM n
121/27 x 54/11 < n < 100/21 : 25/126
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
x:11=54
x:11=54
x =54x11
x =594
có thắc j thì hỏi mik nha
Tính giá trị của các biểu thức sau bằng cách thuận tiện
a) 12 x 11 + 21 x 11 + 11 x 33
b) 132 x 11 – 11 x 32 – 54 x 11
c) 245 x 11 + 11 x 365
d) 78 x 75 + 75 x 89 + 75 x 123
e) 2 x 250 x 50 x 8
g) 1994 x 867 + 1994 x 11
a)12 x 11 + 21 x 11 x 11 + 11 x 33
= ( 12 x 11 ) + ( 21 x 11 x 11 ) + ( 11 x 33 )
= 132+2541+363132+2541+363
= 30363036
b)132x11-11x32-54x11
= ( 132 x 11 ) - ( 11 x 32 ) - ( 54 x 11 )
=1452−352−594=1452−352−594
= 506506
\(a,=11\times\left(12+21+33\right)=11\times66=726\\ b,=11\times\left(132-32-54\right)=11\times46=506\\ c,=11\times\left(245+365\right)=11\times610=6710\\ d,=75\times\left(78+89+123\right)=75\times290=21750\\ e,=\left(2\times50\right)\times\left(250\times8\right)=100\times2000=200000\\ g,=1994\times\left(867+11\right)=1994\times878=1750732\)
a) 12 x 11 + 21 x 11 + 11 x 33
= 11 x ( 12 + 21 + 33)
= 11 x 66
= 726
b) 132 x 11 - 11 x 32 - 54 x 11
= 11 x ( 132 - 32 - 54)
= 11 x 46
= 506
c) 245 x 11 + 11 x 365
= 11 x ( 245 + 365 )
= 11 x 610 = 6710
d) 78 x 75 + 75 x 89 + 75 x 123
= 75 x ( 78 + 89 + 123)
= 75 x 290 = 21750
e) 2 x 250 x 50 x 8
= (2 x 50) x ( 250 x 8)
= 100 x 2000 = 200000
g) 1994 x 867 + 1994 x 11
= 1994 x ( 867 + 11)
= 1994 x 878 = 1750732
tim x :
x + 54 + 26 = 92 - 11
x + 54 + 26 = 92 - 11
x + 80 = 81
x = 81 - 80
x = 1
Chúc bạn học tốt!
x + 54 + 26 = 92 - 11
x + 80 = 81
x = 81 - 80
x = 1
K mk nha
x+54=11