Question

50 баллов решите умоляю вас кто может ​

Answer 1

Объяснение:

1)

$\frac{7a {}^{3} }{b} \times \frac{b {}^{2} }{14a {}^{5} } = \frac{b}{2a {}^{2} }$

2)

$\frac{b}{2c} \times 4c = b \times 2 = 2b$

3)

$\frac{3}{a {}^{3} } \div \frac{15}{a {}^{9} } = \frac{3}{a {}^{3} } \times \frac{a {}^{9} }{15} = \frac{a {}^{6} }{5}$

4)

$49m {}^{4} \div \frac{21m}{n {}^{2} } = 49m {}^{4} \times \frac{n {}^{2} }{21m} = 7m {}^{3} \times \frac{n {}^{2} }{3} = \frac{7m {}^{3}n {}^{2} }{ 3}$

5)

$( \frac{3b {}^{7} }{a {}^{5} } ) {}^{4} \div ( \frac{3b {}^{6} }{a {}^{6} } ) {}^{3} = \frac{81b {}^{28} }{a {}^{20} } \div \frac{21b {}^{18} }{a {}^{18} } = \frac{81b {}^{28} }{a {}^{20} } \times \frac{a {}^{18} }{27b {}^{18} } = \frac{3b {}^{10} }{a {}^{2} }$