\(\frac{\left(\frac{2}{5}\right)^7.5^7+\left(\frac{9}{4}\right)^3:\left(\frac{3}{16}\right)^3}{2^7.5^7+512}\)

\(=\frac{\left(\frac{2}{5}.5\right)^7+\left(\frac{9}{4}:\frac{3}{16}\right)^3}{\left(2.5\right)^7+8^3}\)

\(=\frac{2^7+12^3}{10^7+8^3}\)

Từ đây tính nốt nha!

a) 

\(=\frac{3}{5}.\frac{3}{7}+\frac{3}{5}.\frac{4}{7}-\left(1+\frac{3}{5}\right)\)

\(=\frac{3}{5}\left(\frac{3}{7}+\frac{4}{7}\right)-1-\frac{3}{5}\)

\(=\frac{3}{5}-1-\frac{3}{5}\)

\(=-1\)

b) \(=\frac{2^2.5.7.5^2.7^3}{2^2.5^2.7^{2.2}}\)

\(=\frac{2^2.5^{1+2}.7^{3+1}}{2^2.5^2.7^4}=\frac{2^2.5^3.7^4}{2^2.5^2.7^4}=2^{2-2}.5^{3-2}.7^{4-4}=2^0.5^1.7^0=1.5.1=5\)

a. 2\(\left(2^{-1}+3^{-1}\right):\left(2^{-1}-3^{-1}\right)+\left(2^{-1}:2^0\right):2^3\)

= \(\left(\frac12+\frac13\right):\left(\frac12-\frac13\right)+\left(\frac12:1\right):8\)

=\(\left(\frac36+\frac26\right):\left(\frac36-\frac26\right)+\left(\frac12\right):8\)

= \(\left(\frac56:\frac16\right)+\left(\frac{1}{2_{}}\right):8\)

= \(5+\frac12:8\)

= \(5+\frac{1}{16}\)

= \(\frac51+\frac{1}{16}=\frac{80}{16}+\frac{1}{16}=\frac{81}{16}\)

Ta có : \(\left(2^2:\frac{4}{3}-\frac{1}{2}\right).\frac{6}{5}-17\)

=\(=\left(4.\frac{3}{4}-\frac{1}{2}\right).\frac{6}{5}-17\)

\(=\frac{5}{2}.\frac{6}{5}-17\)

\(=3-17=-14\)

^{_{Tụi quá mới lớp 5 thui}}

bai de the ma cung hoi

re thế này mà k biết làm