Question

допоможіть будь ласка,дам багато балів (​

Answer 1

1) Б / Г

$- \frac{3}{8} \times 9 + ( - \frac{3}{8} ) \times 7 = - \frac{3}{8} \times (9 +7) = - \frac{3}{8} \times 16 = - 3 \times 2 = - 6$

$- \frac{5}{6} \times 8 + ( - {} \frac{5}{6} ) \times 4 = - \frac{5}{6} \times (8 + 4) = - \frac{5}{6} \times 12 = - 5 \times 2 = - 10$

2) В / Г

$- \frac{3}{5} p \times 10q = - 3 \times 2pq = - 6pq$

$- \frac{5}{7}p \times 14q = - \frac{5 \times 14}{7} pq = - 5 \times 2pq = - 10pq$

3) В / Г

$- \frac{3}{4} x = - 24 \\ x = - 24 \div ( - \frac{3}{4}) \\ x = \frac{24 \times 4}{3} \\ x = 32$

$- \frac{2}{3} x = - 18 \\ x = - 18 \div ( - \frac{2}{3} ) \\ x = \frac{18 \times 3}{2} \\ x = 27$

4)

$2(a + 3) - 4(a -2 ) = 2a + 6 - 4a + 8 = - 2a + 14$

$5(b + 4) -3 (b - 5) = 5b + 20 - 3b + 15 = 2b + 35$

5)

$3m - 6n + 9k = 3(m - 2n + 3k)$

$2m - 4n + 6k = 2(m - 2n + 3k)$

6)

$( - 4.27 - ( - 0.27)) \div ( - 0.08) + 1.2 \times ( - 0.5) = \\ - 4.27 - ( - 0.27) = - 4.27 + 0.27 = - 4 \\ - 4 \div( - 0.08) = - 400 \div ( - 8) = 50 \\ 1.2 \times ( - 0.5) = - 0.6 \\ 50 - 0.6 = 49.4$

$( - 8.32 - ( - 0.32)) \div ( - 0.16) + 1.4 \times( - 0.5) = \\ - 8.32 - ( - 0.32) = - 8.32 + 0.32 = - 8 \\ - 8 \div ( - 0.16) = - 800 \div ( - 16) = 50 \\ 1.4 \times ( - 0.5) = - 0.7 \\ 50 - 0.7 = 49.3$