tolong dong d bantu ...................

jawab

(1)
n(AUB) = n(A ) + n(B) - n(A n B)

(2)
[tex]( a^{ \frac{1}{2}} a^{1} b^{-3} b^{ \frac{3}{2}})^{ \frac{2}{3} \,=\, (a^{ \frac{3}{2} }. b^{ -\frac{3}{2}})^{ \frac{2}{3}}\,= \,a.b^{-1}\,=\, \frac{a}{b} [/tex]

3)

[tex] \left[\begin{array}{ccc}x\\y\end{array}\right] \,=\, \left[\begin{array}{ccc}3&-2\\1&1\end{array}\right] \left[\begin{array}{ccc}2&3\\5&-2\end{array}\right] \,= \left[\begin{array}{ccc}-4&13\\7&1\end{array}\right] [/tex]