问题
填空题
129×42先用______去乘129得______,再用______去乘129得______,后把______和______加起来,得______.
答案
129×42
=129×(40+2)
=129×40+129×2
=5160+258
=5418
故答案为:40,5160,2,258,5160,258,5418.
129×42先用______去乘129得______,再用______去乘129得______,后把______和______加起来,得______.
129×42
=129×(40+2)
=129×40+129×2
=5160+258
=5418
故答案为:40,5160,2,258,5160,258,5418.