7.8乘2.3减6.8乘1.3如何用简便方法计算?

2025-03-12 17:57:19
推荐回答(1个)
回答1:

7.8×2.3-6.8×1.3
=(1+6.8)×2.3-6.8×1.3
=2.3+6.8×2.3-6.8×1.3
=2.3+6.8×(2.3-1.3)
=2.3+6.8
=9.1