12.48-4×9.7怎么用拖式简便运算

2025-06-23 00:17:09
推荐回答(1个)
回答1:

答:12.48-4×9.7
=12.48-4×(10-0.3)
=12.48-40+4*0.3
=12+0.48-40+1.2
=1.68-28
= - 26.32