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Ответ:

[tex]1)\frac{9}{2a}*\frac{5a}{3}=\frac{9*5a}{2a*3}=\frac{3*5}{2} =\frac{15}{2} =7,5[/tex]

[tex]2)\frac{5a}{8y}*\frac{7}{10} =\frac{5a*7}{8y*10}=\frac{7a}{8y*2} =\frac{7a}{16y}[/tex]

[tex]3)\frac{b^{2}}{10} *\frac{5}{b}=\frac{b^{2}*5}{10*b} =\frac{b}{2}[/tex]

[tex]4)\frac{12x^{5} }{25} *\frac{15}{8x^{2} } =\frac{12x^{5} *15}{25*8x^{2} } =\frac{3x^{3}*3 }{5*2}=\frac{9x^{3} }{10}[/tex]

[tex]5)\frac{5}{3a}*\frac{2b}{3} =\frac{5*2b}{3a*3}=\frac{10b}{9a}[/tex]

[tex]6)\frac{3x}{4} *\frac{1}{x}=\frac{3x*1}{4*x} =\frac{3}{4}=0,75[/tex]