18 - x * 0,3 = 15
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4/5x 0,5+12/15 x 0,3 + 8:10 x 0,2
4/5x0,5+4/5x0,3+4/5x0,2
4/5x(0,5+0,3+0,2)
4/5x1=4/5
BAn k nha!
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\frac{x}{-15}=\frac{60}{2}\)
\(\Rightarrow2x=60\times\left(-15\right)\)
\(\Rightarrow2x=-900\)
\(\Rightarrow x=-900\div2\)
\(\Rightarrow x=-450\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
\(\begin{array}{l}x - \left( { - \frac{7}{9}} \right) = - \frac{5}{6}\\x + \frac{7}{9} = - \frac{5}{6}\\x = - \frac{5}{6} - \frac{7}{9}\\x = - \frac{{15}}{{18}} - \frac{{14}}{{18}}\\x = \frac{{ - 29}}{{18}}\end{array}\)
Vậy \(x = \frac{{ - 29}}{{18}}\).
b)
\(\begin{array}{l}\frac{{15}}{{ - 4}} - x = 0,3\\x = \frac{{15}}{{ - 4}} - 0,3\\x = - 3,75 - 0,3\\x = - 4,05\end{array}\)
Vậy \(x = - 4,05\).
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\frac{-8}{15}.\left(-30\right).\frac{15}{-8}.\frac{9}{10}\)
\(=-\left(\frac{8}{15}.\frac{15}{8}\right).\left(30.\frac{9}{10}\right)\)
\(=-1.27
=-27\)
\(b,2\frac{1}{18}.\frac{23}{24}.\frac{9}{37}.\frac{48}{-15}\)
\(=\frac{-37.23.9.48}{18.24.37.15}=\frac{23}{15}\)
c, chịu rồi
![](https://rs.olm.vn/images/avt/0.png?1311)
= 0,3 + 0,0(18) = 0,3 + 18 x 0,0(01) = 0,3 + 18 x 1/990 = 7/22
![](https://rs.olm.vn/images/avt/0.png?1311)
\(0,3\left(18\right)=0,3+0,0\left(18\right)=\frac{3}{10}+\frac{1}{10}.0,\left(18\right)=\frac{3}{10}+\frac{1}{10}.18.0,\left(01\right)=\frac{3}{10}+\frac{1}{10}.18.\frac{1}{99}=\frac{7}{22}\)
18 - x * 0,3 = 15
x * \(\frac{3}{10}=3\)
x=10
đúng cho mk nha!
18-x=15:0.3
18-x=50
=>x=18-50
=>x=(-32)