Question

14.5. Найдите значение выражения​

Answer 1

1)

$100b ^{4} \div 4b ^{3} - 5b = \frac{100b {}^{4} }{4b {}^{3} } - 5b = 25b - 5b = 20b$

$20b = 20 \times 0.2 = 4$

2)

$99c + 2 {c}^{5} \div 0.2c {}^{4} = 99c + \frac{2c {}^{5} }{0.2c {}^{4} } = 99c + 10c = 109c$

$109c = 109 \times - \frac{1}{5} = - \frac{109}{5} = - 24 \frac{4}{5}$

3)

$68t {}^{3} \div 3.4t {}^{2} - t = \frac{68t {}^{3} }{3.4t {}^{2} } - t = 20t - t = 19t$

$19t = 19 \times - \frac{4}{7} = - \frac{76}{7} = - 10 \frac{6}{7}$

4)

$- 21.4y + 7y {}^{5} \div 5y {}^{4} = - 21.4y + \frac{7y {}^{5} }{5y {}^{4} } = - 21.4y + \frac{7y}{5} = - 21.4 + 1.4y = - 20y$

$- 20y = - 20 \times ( - 0.03) = 0.6$