12.9*99简便计算
答案:3 悬赏:30 手机版
解决时间 2021-02-18 13:28
- 提问者网友:流星是天使的眼泪
- 2021-02-18 02:22
12.9*99简便计算
最佳答案
- 五星知识达人网友:梦中风几里
- 2021-02-18 02:57
12.9*99
=12.9×(100-1)
=12.9×100-12.9
=1290-12.9
=1277.1
=12.9×(100-1)
=12.9×100-12.9
=1290-12.9
=1277.1
全部回答
- 1楼网友:duile
- 2021-02-18 05:42
12.9 x 99
=12.9 x (100 - 1)
=12.9 x 100 - 12.9 x 1
= 1290 - 12.9
= 1277.1
- 2楼网友:枭雄戏美人
- 2021-02-18 04:13
(1)
18
25 ×99+
18
25 ,
=
18
25 ×(99+1),
=
18
25 ×100,
=72;
(2)12.9×97+12.9×4-12.9,
=12.9×(97+4-1),
=12.9×100,
=1290;
(3)
3
4 ×
9
10 +
1
4 ÷1
1
9 ,
=(
3
4 +
1
4 )×
9
10 ,
=1×
9
10 ,
=
9
10 .
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