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=(-40/51. 32/100. 17/20):64/75
=(-16/75):64/75
=(-16/75).75/64
=(-16/64)=(-1/4)
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) \(\left(-\frac{40}{51}.0,32.\frac{17}{20}\right):\frac{64}{75}\)
\(=\left(-\frac{40}{51}.\frac{8}{25}.\frac{17}{20}\right):\frac{64}{75}\)
\(=\left(\frac{-40.8.17}{51.25.20}\right):\frac{64}{75}\)
\(=\left(\frac{-16}{75}\right).\frac{75}{64}\)
\(=\frac{-1}{1}.\frac{1}{4}=-\frac{1}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) \(\left(-\frac{40}{52}.0,32.\frac{17}{20}\right):\frac{64}{75}\)
= \(\left(-\frac{16}{65}.\frac{17}{20}\right):\frac{64}{75}\)
= \(\left(-\frac{68}{325}\right):\frac{64}{75}\)
= \(\frac{-51}{208}\)
b ) \(-\frac{10}{11}.\frac{8}{9}+\frac{7}{18}.\frac{10}{11}\)
= \(\frac{10}{11}.\left(-\frac{8}{9}+\frac{7}{18}\right)\)
= \(\frac{10}{11}.\left(-\frac{1}{2}\right)\)
= \(\frac{-5}{11}\)
c ) \(\frac{45^{10}.5^{20}}{75^{15}}\)
= \(\frac{5^{10}.3^{20}.5^{20}}{5^{30}.3^{15}}\)
= \(\frac{5^{30}.3^{20}}{5^{30}.3^{15}}\)
= 3 5
= 243
d ) ( - 0,125 ) 3 . 80 4
= -80000
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\left(-\dfrac{40}{51}\cdot0.32\cdot\dfrac{17}{20}\right):\dfrac{64}{75}\)
\(=\left(\dfrac{-40}{51}\cdot\dfrac{17}{20}\cdot\dfrac{8}{25}\right)\cdot\dfrac{75}{64}\)
\(=-\dfrac{16}{75}\cdot\dfrac{75}{64}=-\dfrac{1}{4}\)