Question

Помогите плиз. Алгебра 7 класс

Answer 1

листай вправо =>
$1) \frac{3 {}^{13} }{3^{9} } = 3 ^{4}$
$2)80 + 0.4 \times ( - 1000) = 80 - 400 = - 320$
$3)0.9 \times 100 - 120 = 90 - 120 = - 30$
$4) - 0.2 \times 100 + 55 = - 20 + 55 = 35$
$5)0.8 \times 100 - 95 = 80 - 95 = - 15$
$6)0.7 \times ( - 1000) - 20 = - 700 - 20 = - 720$
$7) - 0.7 \times 100 + 90 = - 70 + 90 = 20$
$8) - 90 + 0.7 \times ( - 1000) = - 90 - 700 = - 790$
$9)45 + 0.6 \times 100 = 45 + 60 = 105$
$10) - 80 + 0.3 \times ( - 1000) = - 80 - 300 = - 380$
$11)0.6 \times ( - 1000) + 50 = - 600 + 50 = - 550$
$12)80 + 0.9 \times ( - 1000) = 80 - 900 = - 820$

Удачи;)

Answer 2

$1) \: \: \: \frac{ {3}^{8} \times {3}^{5} }{ {3}^{9} } = \frac{ {3}^{13} }{ {3}^{9} } = {3}^{4} \\ 2) \: \: \: 80 + 0.4 \times ( - {10)}^{3} = 80 + 0.4 \times ( - 1000) = 80 - 400 = - 320 \\ 3) \: \: \: 0.9 \times ( - {10)}^{2} - 120 = 0.9 \times 100 - 120 = 90 - 120 = - 30$
$4) \: \: \: - 0.2 \times ( - {10)}^{2} + 55 = - 0.2 \times 100 + 55 = - 20 + 55 = 35 \\ 5) \: \: \: 0.8 \times ( - {10)}^{2} - 95 = 80 - 95 = - 15 \\ 6) \: \: \: 0.7 \times ( - {10)}^{3} - 20 = 0.7 \times ( - 1000) - 20 = - 700 - 20 = - 720$
$7) \: \: \: - 0.7 \times ( - {10)}^{2} + 90 = - 0.7 \times 100 + 90 = - 70 + 90 = 20 \\ 8) \: \: \: - 90 + 0.7 \times ( - {10)}^{3} = - 90 - 700 = - 790$
$9) \: \: \: 45 + 0.6 \times ( - {10)}^{2} = 45 + 60 = 105$
$10) \: \: \: - 80 + 0.3 \times ( - {10)}^{3}= - 80 - 300 = - 380 \\ 11) \: \: \: 0.6 \times ( - 10) ^{3} + 50 = - 600 + 50 = - 550 \\ 12) \: \: \: 80 + 0.9 \times ( - {10)}^{3} = 80 - 900 = - 820$