Question

Решите ,можно с корнями не решать

Answer 1

Объяснение:

$(2 + c {)}^{2} - c(c - 4) = 4 + 4c + {c}^{2} - {c}^{2} + 4c = 4 + 8c = 4 + 8( \frac{1}{8} ) = 4 + 1 = 5$

.

$\frac{a - 7x}{a} \div \frac{ax - 7 {x}^{2} }{ {a}^{2} } = \frac{a - 7x}{a} \times \frac{ {a}^{2} }{x(a - 7x)} = \frac{a}{x} = \frac{ - 6}{10} = - 0.6$

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$2b + \frac{5a - 2 {b}^{2} }{b} = \frac{2 {b}^{2} + 5a - 2 {b}^{2} }{b} = \frac{5a}{b} = \frac{5(6)}{ - 60} = \frac{30}{ - 60} = - \frac{1}{2}$

.

$\frac{xy + {y}^{2} }{32x} \times \frac{8x}{x + y} = \frac{y(x + y)}{4} \times \frac{1}{x + y} = \frac{y}{4} = \frac{6.8}{4} = 1.7$

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