Question

256x42-42x56简便方法？

Answer 1

256×42-42×56
=（256-56）×42
=200×42
=840

Answer 2

（256-56）x42=200x(40+2)=8000+400=8400

Answer 3

42*（256-56）=8400

Answer 4

=(256-56)x42=200x42=8400

Answer 5

42*(256-56)=8400