638-38*15怎么简便运算?

2025-06-27 19:49:20
推荐回答(2个)
回答1:

=638-(40-2)×15
=638-40×15+2×15
=638-600+30
=38+30
=68

回答2:

直接计算即可
638-38x15
=638-570
=68