Question

256x42-42x56简便方法？

Answer 1

原式=42×（256—56）
=42×200
=8400

Answer 2

256×42－42×56
=42×(256－56)
=42×200
=8400

Answer 3

256X42-42X56
=（256-56）X42
=200X42
=8400

Answer 4

=（256-56）×42
=200×42
=8400

Answer 5

42×（256-56）
=42×200
=8400