如题所述
第1个回答 2021-01-12
17×23-133-53
=(20-3)(20+3)
-133-53
=20×20-3×3-133-53
=400-(9+133+53)
=400-195
=400-(200-5)
=400-200+5
=200+5
=205
=(20-3)(20+3)
-133-53
=20×20-3×3-133-53
=400-(9+133+53)
=400-195
=400-(200-5)
=400-200+5
=200+5
=205