Question

5,6 x2 + 2,8 x 4 x 2 + 11 ,2 x 7

Answer 1

\(5,6.2+2,8.4.2+11,2.7\)
\(=11,2.1+11,2.2+11.2.7\)
\(=11,2.\left(1+2+7\right)\)
\(=11,2.10\)
\(=112\)
. là dấu nhân

Answer 2

\(5,6\times2+2,8\times4\times2+11,2\times7\)

\(=11,2+2,8\times4\times2+11,2\times7\)

\(=11,2+11,2\times2+11,2\times7\)

\(=11,2+22,4+78,4=33,6+78,4=112\)