Question

a)(-3/5)^7:(-3/5)

b)2^15.9^4 phần 6^6.8^3 

c)3^29.4^16 phần 27^9.8^11

d)(-6)8.(5/6)^7

Hôm nay nhiều bài quá chừng=(

Answer 1

a: \(\left(-\dfrac{3}{5}\right)^7:\left(-\dfrac{3}{5}\right)=\left(-\dfrac{3}{5}\right)^{7-1}=\left(-\dfrac{3}{5}\right)^6=\dfrac{729}{15625}\)

b: \(\dfrac{2^{15}\cdot9^4}{6^6\cdot8^3}=\dfrac{2^{15}\cdot3^8}{2^6\cdot3^6\cdot2^9}=\dfrac{2^{15}}{2^{15}}\cdot3^2=9\)

c: \(\dfrac{3^{29}\cdot4^{16}}{27^9\cdot8^{11}}=\dfrac{3^{29}}{3^{27}}\cdot\dfrac{2^{32}}{2^{33}}=\dfrac{3^2}{2}=\dfrac{9}{2}\)

d: \(\left(-6\right)^8\cdot\left(\dfrac{5}{6}\right)^7=6^8\cdot\dfrac{5^7}{6^7}=6\cdot5^7\)