Question

5.6×9.9怎么简便计算

Answer 1

5.6×9.9
=5.6（10-0.1）
=5.6×10-5.6×0.1
=56-0.56
=55.44

Answer 2

5.6×9.9
＝5.6×（10-0.1）
＝5.6×10-5.6×0.1
＝56-0.56
＝55.44

Answer 3

5.6×9.9
=5.6×（10-0.1）
=56-0.56
=55.44