Răspuns:
10) f. (3x^2 y^3 / z^4) ^2 =
(3x^2y^3)^2 / (z^4)^2=
9x^4y^6 / z^8
g. (- 2x^2y / 3z^3) ^2 =
(2x^2 y / 3z^3)^2=
(2x^2 y) ^2 / (3z^3)^2 =
4x^4y^2 / 9z^6
13)b. 8x / 21y^2 ÷ 6x^2 / 7y =
8x / 21y^2 × 7y /6x^2 =
4 / 3y × 1/ 3x =
4 / 9xy
c. 12x^2 / 7y^4 ÷ 6x^3 /35y^2 =
12x^2 / 7y^4 × 35y^2 / 6 x^3 =
2 / y^2 × 5/x =
10 / xy^2
