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a)|x-3/5|<1/3
\(\Leftrightarrow\frac{-1}{3}< x-\frac{3}{5}< \frac{1}{3}\)
\(\Leftrightarrow\frac{4}{15}< x< \frac{14}{15}\)
Tương tự :)))
a)
\(\begin{array}{l}x:{\left( {\frac{{ - 1}}{2}} \right)^3} = - \frac{1}{2}\\x = - \frac{1}{2}.{\left( {\frac{{ - 1}}{2}} \right)^3}\\x = {\left( {\frac{{ - 1}}{2}} \right)^4}\\x = \frac{1}{{16}}\end{array}\)
Vậy \(x = \frac{1}{{16}}\).
b)
\(\begin{array}{l}x.{\left( {\frac{3}{5}} \right)^7} = {\left( {\frac{3}{5}} \right)^9}\\x = {\left( {\frac{3}{5}} \right)^9}:{\left( {\frac{3}{5}} \right)^7}\\x = {\left( {\frac{3}{5}} \right)^2}\\x = \frac{9}{{25}}\end{array}\)
Vậy \(x = \frac{9}{{25}}\).
c)
\(\begin{array}{l}{\left( {\frac{{ - 2}}{3}} \right)^{11}}:x = {\left( {\frac{{ - 2}}{3}} \right)^9}\\x = {\left( {\frac{{ - 2}}{3}} \right)^{11}}:{\left( {\frac{{ - 2}}{3}} \right)^9}\\x = {\left( {\frac{{ - 2}}{3}} \right)^2}\\x = \frac{4}{9}.\end{array}\)
Vậy \(x = \frac{4}{9}\).
d)
\(\begin{array}{l}x.{\left( {0,25} \right)^6} = {\left( {\frac{1}{4}} \right)^8}\\x.{\left( {\frac{1}{4}} \right)^6} = {\left( {\frac{1}{4}} \right)^8}\\x = {\left( {\frac{1}{4}} \right)^8}:{\left( {\frac{1}{4}} \right)^6}\\x = {\left( {\frac{1}{4}} \right)^2}\\x = \frac{1}{{16}}\end{array}\)
Vậy \(x = \frac{1}{{16}}\).
a) x - 3/5 <1/3
x < 14/15
-x +3/5 < 1/3
x> 3/5 - 1/3
x > 4/15
vậy 4/5 < x < 14/15
b); c) tuong tu
b) | x + 11/2 | > |-5,5| hay 5,5
Xét :
+) x + 11/2 > 5,5
<=> x > 0
+) -x - 11/2 > 5.5
<=> -x > 11 hay x > -11
vậy....
a) | x - 5/3 | > 1/3
Xét :
+) x - 5/3 > 1/3
<=> x > 2 ( tm )
+) -x + 5/3 > 1/3
<=> -x > -4/3 => x > 4/3 (tm)
Vậy,.....