Выполните умножения 9/2а×5а/3= 3)b^2/10×5/b 5)5/3a×2b/3= 7)3b^2/10×15/b^3= 9)5a/8y×7/10=...

Решите задачу:

$1) \frac{9}{2a} * \frac{5a}{3} = \frac{9*5a}{3*2a} = \frac{3*5*1}{1*2*1} = \frac{15}{2} =7.5 \\ \\ 3) \frac{b^2}{10} * \frac{5}{b} = \frac{5*b^2}{10*b} = \frac{1*b}{2*1} = \frac{b}{2}= \frac{1}{2} *b=0.5b \\ \\ 5) \frac{5}{3a} * \frac{2b}{3} = \frac{10b}{9a} \\ \\ 7) \frac{3b^2}{10} * \frac{15}{b^3} = \frac{3b^2*15}{10*b^3} = \frac{3*3}{2*b} =\frac{9}{2b} \\ \\ 9) \frac{5a}{8y} * \frac{7}{10} = \frac{5a*7}{8y*10}= \frac{1*a*7}{8y*2} = \frac{7a}{16y} \\ \\$

$11) \frac{18}{c^4} * \frac{c^3}{24} = \frac{18c^3}{24c^4} = \frac{3*1}{4*c} = \frac{3}{4c} \\ \\ 13) \frac{15x^3}{4} * \frac{12}{5x} = \frac{15x^3*12}{4*5x} = \frac{3*x^2*3}{1*1} = \frac{9x^2}{1} = 9x^2 \\ \\$