4.7x2.8+3.6x9.4-1.5怎样简便计算

2025-06-21 08:19:00
推荐回答(1个)
回答1:

4.7x2.8+3.6x9.4-1.5
=2.8x4.7+7.2x4.7-1.5
=(2.8+7.2)x4.7-1.5
=10x4.7-1.5
=47-1.5
=45.5