Question

(7a).(2b).(-2ab) forma de resolver.​

Answer 1

Oie, Td Bom?!

$= (7a) \: . \: (2b) \: . \: ( - 2ab)$

$= - 7a \: . \: 2b \: . \: 2ab$

$= - 28a{}^{1}b{}^{1}a{}^{1}b{}^{1}$

$= - 28a{}^{1+1}b{}^{1+1}$

$= - 28a {}^{2} b {}^{2}$

Att. Makaveli1996