Question

40.2. Выполните умножение:
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Answer 1

1)

$\frac{9}{2a} *\frac{5a}{3} =\frac{9*5a}{2a*3} =\frac{15}{2} =7.5$

2)

$\frac{5a}{8y} *\frac{7}{10} =\frac{5a*7}{8y*10}= \frac{7a}{16y}$

3)

$\frac{b^{2}}{10} *\frac{5}{b} =\frac{b^{2}*5}{10*b} =\frac{b}{2}$

4)

$\frac{12x^{5}}{25} *\frac{15}{8x^{2}} =\frac{12x^{5}*15}{25*8x^{2} } =\frac{3x^{3}*3}{5*2} =\frac{9x^{3}}{10}$

5)

$\frac{5}{3a} *\frac{2b}{3} =\frac{5*2b}{3a*3} =\frac{10b}{9a}$

6)

$\frac{3x}{4} *\frac{1}{x} =\frac{3x}{4x} =\frac{3}{4} =0.75$

7)

$\frac{3b^{2}}{10} *\frac{15}{b^{3}} =\frac{3b^{2}*15}{10*b^{3}} =\frac{9}{2b}$

8)

$\frac{16x^{5}}{35}*\frac{5}{8x^{3}} =\frac{16x^{5}*5}{35*8x^{3}} =\frac{2x^{2}}{7}$

9)

$\frac{5a}{8y} *\frac{7}{10} =\frac{5a*7}{8y*10} =\frac{7a}{16y}$

10)

$\frac{9}{2a} *\frac{5a}{3} =\frac{9*5a}{2a*3} =\frac{15}{2} =7.5$

11)

$\frac{18}{c^{4}} *\frac{c^{3}}{24} =\frac{18*c^{3}}{c^{4}*24} =\frac{3}{4c}$

12)

$\frac{3}{4a^{3}} *\frac{16a^{2}}{9} =\frac{3*16a^{2}}{4a^{3}*9} =\frac{4}{3a}$

13)

$\frac{15x^{3}}{4} *\frac{12}{5x} =\frac{15x^{3}*12}{4*5x}=9x^{2}$

14)

$\frac{15}{3ab} *\frac{12b^{3}}{3} =\frac{15*12b^{3}}{3ab*3} =\frac{20b^{2}}{a}$

15)

$\frac{18}{c^{4}} *\frac{c^{3}}{24} =\frac{18*c^{3}}{c^{4}*24} =\frac{3}{4c}$