a. 7x7x7x7=74
b. 3x15x15x5=33x53
c. 7x35x7x25=73x53
d.2x8x24x12x3=243
e.25x84=217
g.6255:257=56
giải hộ mình bài 2 với mình cần gấp
Bài 1: \(a,7.7.7.7=7^7\)
\(b,3.15.15.5=\left(3.5\right).15.15=15.15.15=15^3\)
\(c,7.35.7.25=7.7.5.7.5.5=7^3.5^3=\left(7.5\right)^3=35^3\)
\(d,2.8.24.12.3=2.2.4.2.3.4.3.4.3=2^3.3^3.4^3=\left(2.3.4\right)^3=24^3\)
\(e,2^5.8^4=2^5.\left(2^3\right)^4=2^5.2^{12}=2^{\left(5+12\right)}=2^{17}\)
\(g,625^5:25^7=\left(25^2\right)^5:25^7=25^{10}:25^7=25^{\left(10-7\right)}=25^3\)
Bài 2:
\(a,17^2-15^2=289-225=64=\hept{\begin{cases}2^6\\4^3\\8^2\end{cases}}\)
\(b,4^3-2^3+5^2=64-8+25=81=\hept{\begin{cases}3^4\\9^2\end{cases}}\)