Question

Срочно нужна помощь! даю 20 БАЛОВ​

Answer 1

$№2$

$1) \: 126000 = 1.26 \times {10}^{5}$

$2)0.0035 = 3.5 \times {10}^{ - 3}$

$№3$

$1) \: {a}^{7} \times {a}^{ - 5} = {a}^{7 + ( - 5)} = {a}^{7 - 5} = {a}^{2}$

$2) \: {a}^{ - 10} \div {a}^{ - 13} = {a}^{ - 10 - ( - 13)} = {a}^{ - 10 + 13} = {a}^{3}$

$3) \: ({a}^{9} )^{ - 2} \times {a}^{20} = {a}^{9 \times ( - 2)} \times {a}^{20} = {a}^{ - 18} \times {a}^{20} = {a}^{ - 18 + 20} = {a}^{2}$

$4) \: 0.8 {a}^{11} b^{ - 14} \times 1.2a^{ - 8} {b}^{16} = 0.96 {a}^{11 + ( - 8)} {b}^{ - 14 + 16} = 0.96 {a}^{11 - 8} {b}^{ - 14 + 16} = 0.96 {a}^{3} {b}^{2}$