Question

78 x 31 + 78 x 24 + 55 x 22

Answer 1

78 x 31 + 78 x 24 + 55 x 22

= 78 x ( 31 + 24 ) + 55 x 22

= 78 x 55 + 55 x 22

= 55 x ( 78 + 22 )

= 55x 100

= 5500

Answer 2

\(78.31+78.24+55.22\)

\(=78.\left(31+24\right)+55.22\)

\(=78.55+55.22\)

\(=55.\left(78+22\right)\)

\(=55.100\)

\(=5500\)

Answer 3

78 x 31 + 78 x 24 + 55 x 22

= 78 x (31 + 24) + 55 x 22

= 78 x 55 + 55 x 22

= 55 x (78 + 22)

= 55 x 100

= 5 500

Chúc bạn học tốt!