Question

            tính hợp lí nếu có thể 

            123 * 456 + 456 * 321 - 256 *444

Answer 1

\(123.456+456.321-256.444=456.\left(123+321\right)-256.444=456.444-256.444=444.\left(456-256\right)=444.200=88800\)

Answer 2

123.456+456.321-256.444

=456.(123+321)-256.444

=456.444-256.444

=444.(456-256)

=444.200

=88800

 

Answer 3

\(123\cdot456+456\cdot321-256\cdot444\)

\(=456\left(123+321\right)-256\cdot444\)

\(=456\cdot444-256\cdot444\)

\(=444\left(456-256\right)\)

\(=444\cdot200\)

=88800