Question

помогите срочно пожалуйста

Answer 1

$0.8a {}^{ - 7} b {}^{8} times 12.5a {}^{9} b {}^{ - 8} = 10 {a}^{9 - 7} b {}^{8 - 8} = 10a {}^{2} b {}^{0} = 10 {a}^{2}$