Question

ПОМОГИТЕ ПЖЖЖЖ
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Answer 1

Ответ:

6.

$\frac{5a}{ {b}^{2} + ab } - \frac{5b}{ {a}^{2} + ab} = \frac{5a - 5b}{ab} = \frac{5(a - b)}{ab}$

7.

Объяснение:

$\frac{ {18}^{2} - 16 \times ( - 7.5) {}^{2} }{ {18}^{2} + 8 \times 18 \times ( - 7.5) + 16 \times ( - 7.5) {}^{2} } = \frac{ {18}^{2} - 2 {}^{4} \times {7.5}^{2} }{324 - 1080 + {2}^{4} \times 7.5 {}^{2} } = \frac{{18}^{2} { - 2}^{4} \times \frac{ {15}^{2} }{ {2}^{2} } }{324 - 1080 + 2 {}^{4} \times \frac{ {15}^{2} }{ {2}^{2} } } = \frac{ {18}^{2} { - 2}^{2} \times {15}^{2} }{324 - 1080 + {2}^{2} \times {15}^{2} } = \frac{ {18}^{2} - {30}^{2} }{324 - 1080 + 900} = \frac{(18 - 30) \times (18 + 30)}{144} = \frac{ - 12 \times 48}{144} = \frac{ - 576}{144} = - 4$

Ответ: -4