27ᠧ99+57简便方法?

2025-03-23 20:42:11
推荐回答(2个)
回答1:

27X(1十99)十57=2700十(57一27)=2670

回答2:

27×99+57
=27×(100-1)+57
=2700-27+57
=2700+(57-27)
=2700+30
=2730