来自付昀的问题
【数学医院.318-139-39=318-(139-39)=318-100=218______354-(154+72)=354-154+72=200+72=272______】
数学医院.
318-139-39
=318-(139-39)
=318-100
=218
______
354-(154+72)
=354-154+72
=200+72
=272
______
1回答
2020-11-30 11:56