7.8×5.6 2.3 ×4.4用简便方法怎么做

2025-04-05 04:51:04
推荐回答(1个)
回答1:

7.8×5.6+2.3 ×4.4
=5.5××5.6+2.3×5.6+2.3 ×4.4
=30.8+2.3×(5.6+4.4)
=30.8+2.3×10
=30.8+23
=53.8