Tìm x:
|x - 8| = 19
|x + 14| = 492
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2/(11x13) = 1/11 - 1/13 ; 2/(13x15) = 1/13 - 1/15 ; 2/(15x17) = 1/15 - 1/17 ; 2/(17x19) = 1/17 - 1/19 ; 2/(19x21) = 1/19 - 1/21
2/(11x13) + 2/(13x15) + 2/(15x17) + 2/(17x19) 2/(19x21) =
1/11 - 1/13 + 1/13 - 1/15 + 1/15 - 1/17 + 1/17 - 1/19 + 1/19 - 1/21 = 1/11 - 1/21 = 101231
Hay: 10/231 x 462 - X = 19
20 - X = 19
X = 20 - 19
X = 1,đó là phần b
\(x\in\left(\infty;-\infty\right)\)
\(\frac{19x+50}{14}=\frac{9}{1}\Rightarrow\left(19x+50\right)1=14.9\)
\(\frac{\left(19x+50\right)1}{19x}=\frac{14.9}{19x}\)
\(\frac{19x+50}{19x}=\frac{14.19}{19x}\)
\(\Rightarrow x=4\)
a, \(\left(19.x+2.5^2\right)\div14=\left(13-8\right)^2-4^2\)
\(\left(19.x+2.25\right)\div14=5^2-4^2\)
\(\left(19.x+2.25\right)\div14=25-16\)
\(\left(19.x+50\right)\div14=9\)
\(\left(19.x+50\right)=9.14\)
\(19.x+50=126\)
\(19.x=126-50\)
\(19.x=76\)
\(\Rightarrow x=76\div19\)
\(\Rightarrow x=4\)
Vậy x = 4
b, \(2.3^x=10.3^{12}+8.27^4\)
\(2.3^x=10.3^{12}+8.\left(3^3\right)^4\)
\(2.3^x=10.3^{12}+8.3^{12}\)
\(2.3^x=\left(10+8\right).3^{12}\)
\(2.3^x=18.3^{12}\)
\(2.3^x=2.3^3.3^{12}\)
\(2.3^x=2.3^{15}\)
\(\Rightarrow x=15\)
Vậy x = 15
\(15-\left(x-4\right)=8\)
\(x-4=15-8\)
\(x-4=7\)
\(x=7+4\)
\(x=11\)
a ) x - ( - 18 ) = -24
x + 18 = -24
x = -24 - 18
x = -6
b ) -x - 17 + 8 = 33 - 19
-x - 17 + 8 = 14
-x - 17 = 14 - 8
-x - 17 = 6
-x = -( 6 + 17 )
-x = - 23
c ) 15 - ( -4 + 7 ) = x - 14
15 + 4 + 7 = x - 14
27 = x - 14
x - 14 = 27
x = 27 + 14
x = 41
d ) 9 - 25 = ( 7 - x ) - ( 25 + 7 )
( 7 - x ) - 32 = -16
7 - x = -16 + 32
-7 - x = -16
x = -7 - ( - 16)
x = -7 + 16
x = 9
a) 3 x X x 2/3 = 4/5
3.x=6/5
x=2/5
b) 3,94 x 18,24 + 18,24 x 3,72 + 18,24 x 2,34
=18,24(3,94+3,72+2,34)
=18,24.10
=182,4
d) 8/19 x 2/7 + 8/19 x 1/7 + 8/19 x 4/7
=8/19(2/7+1/7+4/7)
=8/19.1
=8/19
a)\(\left|x-8\right|=19\)
TH1:x-8=-19
x=-11
TH2:x-8=19
x=27
b)\(\left|x+14\right|=492\)
TH1:x+14=492
x=478
TH2:x+14=-492
x=-506
\(\left|x-8\right|=19\)
\(\Rightarrow\orbr{\begin{cases}x-8=19\\x-8=-19\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=27\\x=-11\end{cases}}\)
\(\left|x+14\right|=492\)
\(\Rightarrow\orbr{\begin{cases}x+14=492\\x+14=-492\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=478\\x=-506\end{cases}}\)