O sa iti fac doar doua din fiecare, ca sa intelegi cum se fac :)
[tex]7) \\ a)\quad -4 X^{2}Y \cdot 3XY^{2}=-12X^{3}Y^{3} \\ b)\quad 8,2XZ\cdot5X^{3}YZ =41X^{4}YZ^{2}[/tex]
[tex]8) \\ a)\quad (3X^{5} Y)^{3} = 27X^{15}Y^{3} \\ b)\quad (-2XYZ^{4})^{2} =4X^{2}Y^{2}X^{8}[/tex]
[tex]9) \\
a)\quad 16X^{3}Y:(-2XY) = -8X^{2} \\ b)\quad -6,4Y^{2}Z^{3}:0,4YZ = -16YZ^{2}[/tex]
[tex]1)d) \quad 7\frac{1}{3}X\cdot 2 \frac{1}{2}XY = \frac{7\cdot3+1}3}X\cdot \frac{2\cdot2+1}{2}XY = \frac{22}3}X\cdot \frac{5}{2}XY = \frac{110}{6} X^{2}Y \\ \\ 2)d)\quad (1,5ZY^{3}) ^{3} = 3,375Z^{3}Y^{9} \\ \\[/tex]
La 3)d) e la fel ca la 1)d)
