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=(-40/51. 32/100. 17/20):64/75
=(-16/75):64/75
=(-16/75).75/64
=(-16/64)=(-1/4)
\(A=\left(-\dfrac{40}{51}\cdot0.32\cdot\dfrac{17}{20}\right):\dfrac{64}{75}\)
\(=\left(\dfrac{-40}{51}\cdot\dfrac{17}{20}\cdot\dfrac{8}{25}\right)\cdot\dfrac{75}{64}\)
\(=-\dfrac{16}{75}\cdot\dfrac{75}{64}=-\dfrac{1}{4}\)
\(\dfrac{17}{40}=\dfrac{7}{10}-x+\dfrac{13}{20}\)
\(\Rightarrow\dfrac{17}{40}=\dfrac{28}{40}-x+\dfrac{26}{40}\)
\(\Rightarrow\dfrac{17}{40}=\dfrac{44}{40}-x\)
\(\Rightarrow x=\dfrac{44}{40}-\dfrac{17}{40}\)
\(\Rightarrow x=\dfrac{27}{40}\)
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
-40/51 x 0,32 x 17/20 = -16 / 75
\(\frac{-40}{51}\times0,32\times\frac{17}{20}=\frac{-40}{51}\times\frac{8}{25}\times\frac{17}{20}\)\(=\frac{-40\times8\times17}{51\times25\times20}=\frac{-2\times8}{3\times25}=\frac{-16}{75}\)
~Chúc bạn hok tốt~
#Sa-ngu-ngốc