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![](https://rs.olm.vn/images/avt/0.png?1311)
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a: =-5/21
b: \(=\dfrac{15}{4}-\dfrac{9}{4}=\dfrac{6}{4}=\dfrac{3}{2}\)
c: \(=\left(\dfrac{31}{10}-\dfrac{25}{10}\right)\cdot3-2=\dfrac{6}{10}\cdot3-2=\dfrac{18}{10}-\dfrac{20}{10}=\dfrac{-2}{10}=\dfrac{-1}{5}\)
d: \(=\dfrac{4}{3}\cdot\dfrac{1}{20}=\dfrac{4}{60}=\dfrac{1}{15}\)
a: \(=\dfrac{-15}{25}\cdot\dfrac{8}{16}=\dfrac{-3}{5}\cdot\dfrac{1}{2}=\dfrac{-3}{10}\)
b: \(=\dfrac{2}{3}+\dfrac{2}{7}=\dfrac{20}{21}\)
c: \(=\dfrac{3}{2}\cdot\dfrac{-3+2}{4}=\dfrac{3}{2}\cdot\dfrac{-1}{4}=\dfrac{-3}{8}\)
d: \(=\dfrac{7}{11}\cdot\dfrac{11}{7}\cdot\dfrac{-3}{41}=-\dfrac{3}{41}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1.
\(\sqrt{a}.\sqrt{\frac{32}{a}}=\sqrt{a.\frac{32}{a}}=\sqrt{32}=\sqrt{4^2.2}=4\sqrt{2}\)
2.
\(\sqrt{3,6a}.\sqrt{10a^3}=\sqrt{3,6a.10a^3}=\sqrt{36a^4}=\sqrt{(6a^2)^2}=6a^2\)
3.
\(\sqrt{0,5a}.\sqrt{50a^3}=\sqrt{0,5a.50a^3}=\sqrt{25a^4}=\sqrt{(5a^2)^2}=5a^2\)
4.
\(\sqrt{2a^3}.\sqrt{50a}=\sqrt{2a^3.50a}=\sqrt{100a^4}=\sqrt{(10a^2)^2}=10a^2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{1}{3}\left|4-2x\right|=x+3\\ \Leftrightarrow\left|4-2x\right|=3x+9\\ \Leftrightarrow\left[{}\begin{matrix}4-2x=3x+9\\4-2x=-3x-9\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}-5x=5\\x=-13\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-1\\x=-13\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Em cần cụ thể bài nào thì nhờ mọi người nha, đừng up lên không nói gì như thế là không tôn trọng em ạ!
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{3^7.8^3}{6^5.12^2}=\dfrac{3^7.\left(2^3\right)^3}{\left(2.3\right)^5.\left(2^2.3\right)^2}=\dfrac{3^7.2^9}{2^5.3^5.2^4.3^2}=\dfrac{3^7.2^9}{3^7.2^9}=1\)
\(\dfrac{15^3+3.15^2+5^2.3^3}{7.5.3^3}=\dfrac{3^3.5^3+3.3^2.5^2+3^3.5^2}{7.5.3^3}=\dfrac{5.3^3\left(5^2+5+5\right)}{7.5.3^3}=\dfrac{25+5+5}{7}=5\)
c) \(\dfrac{3^7\cdot8^3}{6^5\cdot12^2}=\dfrac{3^7\cdot2^9}{2^5\cdot3^5\cdot3^2\cdot2^4}=1\)
d) \(\dfrac{15^3+3\cdot15^2+5^2\cdot3^3}{7\cdot5\cdot3^3}=\dfrac{15^3+3\cdot15^2+15^2\cdot3}{7\cdot5\cdot3^3}\)
\(=\dfrac{15^2\cdot\left(15+6\right)}{7\cdot5\cdot3^3}=\dfrac{3^3\cdot5^2\cdot7}{7\cdot5\cdot3^3}=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1 replaced
2 freezed
3 applicants
4 priceless
5 breakage
6 suspiciously
7 suited
8 beheaded
9 residential
10 outrageous
1920cm2
diện tích hình tam giác là
|(48:60.100).48|:2=1920(cm2)