Question

Tính bằng cách hợp lý nhất :

a]3.26x728+3.26+3.26x270

Answer 1

=3,26(728+1+270)

=3,26*999=3256,74

Answer 2

\(3,26\cdot728+3,26+3,26\cdot270\)

\(=3,26\cdot\left(728+1+270\right)\)

\(=3,26\cdot999\)

\(=3,26\cdot\left(1000-1\right)\)

\(=3,26\cdot1000-1\cdot3,26\)

\(=3260-3,26\)

\(=3256,74\)