Question

99×999+199怎样算简便？

Answer 1

这个可以这样算，99乘以999+199等于99乘以999+99+100等于99乘以（999+1）+100

Answer 2

99×999+199
=99×999+99+100
=99×(999+1)+100
=99×1000+100
=99000+100
=99100.

Answer 3

99×999+199简便算法
＝99×999+99+100
＝99×（999+1）+100
＝99×1000+100
＝99000+100
＝99100

Answer 4

解答一:
99×999+199
=99×（1000-1）+199
=99×1000-99×1+199
=99000+（199-99)
=99000+100
=99100
解法二:
99×999+199
=（100-1）×999+199
=100×999-1×999+199
=99900-800
=99100

Answer 5

(100-1)(1000-1)+199=100000-100-1000+1+199=98900+200=99100