4 Efectuati: a) \( \left(x^{2}\right) \cdot(-2 x) ; \) b) \( \left(\frac{1}{2} x y\right) \cdot\left(-\frac{4}{3} x^{2} y\right) \) \( \begin{array}{ll}\text { c) }\left(\sqrt{2} a^{2} b\right) \cdot\left(-\frac{2 \sqrt{2}}{3} b\right) ; & \text { d) }\left(2 x^{2}\right)^{2} \\ \text { e) }\left(-\frac{1}{2} a^{2}\right)^{3} ; & \text { f) }\left(5 x^{2}-7 x^{2}\right)^{2} \\ \text { g) }\left(-3 x^{2}\right):(+x), x \neq 0 ; \\ \text { h) }\left(-14 x^{2} y\right):(7 x y), x, y \in \mathbf{R}^{*} ; \\ \text { i) }\left(-\frac{3}{7} a^{2} b^{2}\right):\left(-\frac{1}{14} a\right), a \neq 0 \\ \text { j) } x^{7}:\left(-2 x^{4}\right), x \in \mathbf{R}^{*} ; \\ \text { k) }\left(-\frac{4}{3} a^{3}\right):\left(+\frac{2}{3} a^{2}\right), a \in \mathbf{R}^{*}\end{array} \)
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