According to the meaning of power and the multiplication rule of fraction, we can get (B / a) ^ 2 = B / a ` B / a = B ` B / a ` a = B ^ 2 / A ^ 2 1. Can you calculate (B / a) ^ n (n is a positive integer), from which you can get the multiplication rule of fractions 2. Calculate (- X / y) ^ 2 '(- y ^ 2 / x) ^ 3 ÷ (- XY ^ 4)

According to the meaning of power and the multiplication rule of fraction, we can get (B / a) ^ 2 = B / a ` B / a = B ` B / a ` a = B ^ 2 / A ^ 2 1. Can you calculate (B / a) ^ n (n is a positive integer), from which you can get the multiplication rule of fractions 2. Calculate (- X / y) ^ 2 '(- y ^ 2 / x) ^ 3 ÷ (- XY ^ 4)

1（b/a）^n=b/a`b/a`b/a…… =b`b`b…… /a`a`a…… =b^n/a^n
Fractional multiplication is the multiplication of the numerator and the denominator
2 original formula = (- x) ^ 2 / y ^ 2 '(- y ^ 6) / x ^ 3 ÷ (- XY ^ 4) = 1 / x ^ 2