[tex]\displaystyle\bf\\1)\\\\\frac{2}{a} =\frac{2\cdot 3}{a\cdot 3} =\frac{6}{3a} \\\\\\2)\\\\\frac{2}{a} =\frac{2\cdot a}{a\cdot a} =\frac{2a}{a^{2} }\\\\\\3)\\\\\frac{2}{a} =\frac{2\cdot b}{a\cdot b} =\frac{2b}{ab}\\\\\\4)\\\\\frac{2}{a} =\frac{2\cdot ab}{a\cdot ab} =\frac{2ab}{a^{2} b}\\\\\\5)\\\\\frac{2}{a} =\frac{2\cdot a^{2} }{a\cdot a^{2} } =\frac{2a^{2} }{a^{3} }[/tex]

1.

2/а = 3/3 * 2/а = 6/3а,

2.

2/а = а/а * 2/а = 2а/а²,

3.

2/а = в/в * 2/а = 2в/ав,

4.

2/а =  ав/ав * 2/а = 2ав/а²в,

5.

2/а = а²/а² * 2/а = 2а²/а³