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bn ơi chỉ có phép nhân mới làm được như vậy thui còn chia thì làm bình thường theo đúng quy tắc nhé bn:
-1,6:\(\left(1+\dfrac{2}{3}\right)\)
=\(-1,6:\dfrac{5}{3}\)
=\(\dfrac{-24}{25}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=-1,6:\left(1+\frac{2}{3}\right)\)
\(A=\frac{-8}{5}:\frac{5}{3}\)
\(A=\frac{-24}{25}\)
\(B=1,4.\frac{15}{29}-\left(\frac{4}{5}+\frac{2}{3}\right):2\frac{1}{5}\)
\(B=\frac{7}{5}.\frac{15}{29}-\frac{22}{15}:\frac{11}{5}\)
\(B=\frac{21}{29}-\frac{22}{15}.\frac{5}{11}\)
\(B=\frac{21}{29}-\frac{2}{3}\)
\(B=\frac{5}{87}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=\dfrac{1.3-1.6}{2.6}-\dfrac{5}{6}:2\)
\(=-\dfrac{3}{26}-\dfrac{5}{12}\)
\(=\dfrac{-83}{156}\)
b: \(=20.8\left(-15.5+3.5\right)+9.2\left(3.5-15.5\right)\)
\(=-12\left(20.8+9.2\right)\)
\(=-12\cdot30=-360\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\frac{1,6:\left(1+2\right)}{3}\)
\(A=\frac{1,6:3}{3}\)
\(A=\frac{8}{45}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-3\dfrac{1}{7}:\left\{\left[2+1\dfrac{3}{5}:\left(\dfrac{4}{3}-1,6\right)\right]+25\%\right\}\)
\(=-\dfrac{22}{7}:\left\{\left[2+\dfrac{8}{5}:\left(\dfrac{4}{3}-\dfrac{8}{5}\right)\right]+\dfrac{1}{4}\right\}\)
\(=-\dfrac{22}{7}:\left[\left(2+\dfrac{8}{5}:\left(-\dfrac{4}{15}\right)\right)+\dfrac{1}{4}\right]\)
\(=-\dfrac{22}{7}:\left(2-6+\dfrac{1}{4}\right)\)
\(=-\dfrac{22}{7}:\left(-\dfrac{15}{4}\right)\)
\(=-\dfrac{22}{7}.\dfrac{-4}{15}\)
\(=\dfrac{88}{105}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
A=-1,6:(1+2/3)
A=-1,6 : \(\frac{5}{3}\)
A=\(-1,6.\frac{3}{5}\)
A=-0,96