Предмет: Алгебра, автор: Mika6678

Срроочнооо. Даааю 50 баллов. 3 и 4 пллиз

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Ответы

Автор ответа: gjmargosha

0

$3)( - 2a ^{6} {b}^{3} ) ^{3} \div (5 {a}^{8} {b}^{4} ) ^{2} = - 8 {a}^{18} {b}^{9} \div 25 {a}^{16} {b}^{8} = - 0.32 {a}^{2} b$ при а=⅞, b=-3/25
$- 0.32 \times ( \frac{7}{8} ) ^{2} \times ( - \frac{3}{25} ) = - 0.32 \times \frac{49}{64} \times ( - \frac{3}{25} ) = \frac{0.005 \times 49 \times 3}{25} = \frac{0.735}{25} = 0.0294$
$4)(3 {a}^{9} {b}^{3} ) ^{2} \div ( - 4 {a}^{4} b) ^{4} = 9{a}^{18} {b}^{6} \div 256 {a}^{16} {b}^{4} = \frac{9 {a}^{2} \times {b}^{2} }{256}$

при а=-5/9; b=-16

$\frac{9 \times( \frac{ - 5}{9} ) ^{2} \times {( - 16)}^{2} }{256} =\frac{9 \times \frac{25}{81} \times 256}{256} = \frac{9 \times 25}{81} = \frac{25}{9} = 2 \frac{7}{9}$

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