(a^m)^n = a^(mn)a^m*a^n = a^(m+n)a^m/a^n = a^(m-n)a^m*b^m = (ab)^m^ cтепень----21^12 / (7^4)^3*(3^2)^4 = (7*3)^12 / (7^12*3^8) = 7^12*3^12 / 7^12*3^8 = 3^12/3^8 = 3^4 = 81
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(a^m)^n = a^(mn)
a^m*a^n = a^(m+n)
a^m/a^n = a^(m-n)
a^m*b^m = (ab)^m
^ cтепень
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21^12 / (7^4)^3*(3^2)^4 = (7*3)^12 / (7^12*3^8) = 7^12*3^12 / 7^12*3^8 = 3^12/3^8 = 3^4 = 81