Given 8A ^ 3B ^ m divided by 28a ^ n of B ^ 2 = 2B ^ 2 of 7, find the value of M, n (2) If 10 ^ a = 20, 10b = 5 ^ - 1, find 9 ^ a divided by 3 ^ 2B

Given 8A ^ 3B ^ m divided by 28a ^ n of B ^ 2 = 2B ^ 2 of 7, find the value of M, n (2) If 10 ^ a = 20, 10b = 5 ^ - 1, find 9 ^ a divided by 3 ^ 2B

Simplify the formula on the left side of the equal sign, that is, 2A ^ 3B ^ (M + 2) of 7a ^ n, the 2 / 7 on both sides of the equation can be reduced, and then the molecule is equal to the molecule, that is, B ^ (M + 2) = B ^ 2, and the denominator is equal to the denominator, that is, a ^ (n-3) = 1, so m = 0, n = 3