a)76:72=76-2=74
b)162:42=(42)2:42=44:42=44-2=42
c,252:52=(52)2:52=54:52=54-2=52
d,sai đề bài
a) \(7^6:7^2=7^5\)
b)\(16^2:4^2=4^2\)
c)\(25^2:5^2=5^2\)
d)\(3^2:9^3=3^2:3^6=3^{-4}\)
a, 7\(^6\):7\(^2\)=7\(^{6-2}\)=7\(^4\)
b, 16\(^2\): 4\(^2\)=(4\(^2\))\(^2\): 4\(^2\)=4\(^4\):4\(^2\)=4\(^{4-2}\)=4\(^2\)
c,25\(^2\): 5\(^2\)=(5\(^2\))\(^2\): 5\(^2\)=5\(^4\):5\(^2\)=5\(^{4-2}\)=5\(^2\)
d, 3\(^2\): 9\(^3\) =3\(^2\): (3\(^2\))\(^3\)=3\(^2\)- 3\(^6\)=3\(^{2-6}\)=3\(^{-4}\)
Tích cho mình với nhé bạn