Question

5.8×5.6 44×0.58简便方法？

Answer 1

5.8x5.6+44x0.58
=0.58x10x5.6+44x0.58
=0.58x（10x5.6+44）
=0.58x（56+44）
=0.58x100
=58

Answer 2

5.8x5.6+44×0.58
=5.8x5.6+4.4x5.8
=5.8x(5.6+4.4)
=5.8x10
=58
解题思路是可以把后面的44×0.58变成4.4×5.8，两个数相乘，其中一个数缩小十倍，另外一个数就可以扩大十倍。乘机不便。