Question

tính nhanh

43.17+29.57+13.43+57

help me !!!!!

 

Answer 1

   \(43\cdot17+29\cdot57+13\cdot43+57\)

\(=43\cdot\left(17+13\right)+57\cdot\left(29+1\right)\)

\(=43\cdot30+57\cdot30\)

\(=30\cdot\left(43+57\right)\)

\(=30\cdot100\)

\(=3000\)

Answer 2

   43.17+29.57+13.43+57

=43.17+29.57+13.43+57.1

=43.(17+13)+57.(29+1)

=43.30+57.30

=30.(43+57)

=30.100

=3000