Question

1)(A4b5):(a2b2)3 при а=-0,5, b=2 2)(x7y4)3:(x10y5) при х =-3 y=2/3 3)(-2a6b3)3:(5a8b4)2 при a=7/8 b=-3/25

Answer 1

1) $\frac{ {a}^{4} {b}^{5} }{ 3{a}^{2} {b}^{2} } = \frac{ {a}^{2} {b}^{3} }{ {3} }$
При а = -0,5; b = 2:
$\frac{ {( - 0.5)}^{2} {2}^{3} }{3} = \frac{( - 0.25) \times 8}{3} = \frac{2}{3}$
2) $\frac{ 3{x}^{7} {y}^{4} }{ {x}^{10} {y}^{5} } = \frac{3}{ {x}^{3}y }$
При x = -3; y = $\frac{2}{3}$:
$\frac{3}{ {x}^{3}y } = \frac{3}{ {( - 3)}^{3} \times \frac{2}{3} } = \frac{3}{ - 27 \times \frac{2}{3} } = \frac{9}{81 \times 2} = \frac{1}{18}$