1、563-397的简便方法:
=563 - (400 - 3)
=563 -400 + 3
=163 + 3
=166
2、563-397的简便方法:
=(400 + 163)- 397
=400 - 397 + 163
=3 + 163
=166
1、563-397的简便方法:
=563 - (400 - 3)
=563 -400 + 3
=163 + 3
=166
2、563-397的简便方法:
=(400 + 163)- 397
=400 - 397 + 163
=3 + 163
=166