1.4 x 100=?
25,08 x 10 = ?
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2,1 x 100 =210
25,08 x 100=2508
4,061 x 100=406,1
7,2 x 1000=7200
5,32 x 100=532
0,894x1000=894
9,63 x 10=96,3
5,328x10=53,28
2,1 x 100 = 210
25,08 x 100 = 2508
4,061 x 100 = 406100
7,2 x 1000 = 7200
5,32 x 100 = 532
0,894 x 1000 = 894
9,63 x 10 = 96,3
5,328 x 10 = 53.28
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1,4x10=14\)
\(25,08x100=2508\)
\(0,894x1000=894\)
\(7,69x50=384,5\)
\(12,6x800=10080\)
\(82,16x40=3286,4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải chi tiết:
a) 1,4×10=141,4×10=14
2,1×100=2102,1×100=210
7,2×1000=72007,2×1000=7200
b) 9,63×10=96,39,63×10=96,3
25,08×100=250825,08×100=2508
5,32×1000=53205,32×1000=5320
c) 5,328×10=53,285,328×10=53,28
4,061×100=406,14,061×100=406,1
0,894×1000=894
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có : (12+13+14+....+110)×x=19+28+....+82+91(12+13+14+....+110)×x=19+28+....+82+91
Đặt A=19+28+....+82+91A=19+28+....+82+91
=(9−1−1−....−1)+(82+1)+(73+1)+.....+(19+1)=(9−1−1−....−1)+(82+1)+(73+1)+.....+(19+1)
=1+102+103+...+109=102+103+....+109+1010=1+102+103+...+109=102+103+....+109+1010
=(12+13+14+....+110)×10=(12+13+14+....+110)×10 (1)
Từ (1), suy ra:
(12+13+14+...+110)×x=(12+13+14+....+110)×10(12+13+14+...+110)×x=(12+13+14+....+110)×10
⇒x=10⇒x=10
Vậy x=10x=10
~ Học tốt ~
Ta có : (12+13+14+....+110)×x=19+28+....+82+91(12+13+14+....+110)×x=19+28+....+82+91
Đặt A=19+28+....+82+91A=19+28+....+82+91
=(9−1−1−....−1)+(82+1)+(73+1)+.....+(19+1)=(9−1−1−....−1)+(82+1)+(73+1)+.....+(19+1)
=1+102+103+...+109=102+103+....+109+1010=1+102+103+...+109=102+103+....+109+1010
=(12+13+14+....+110)×10=(12+13+14+....+110)×10 (1)
Từ (1), suy ra:
(12+13+14+...+110)×x=(12+13+14+....+110)×10(12+13+14+...+110)×x=(12+13+14+....+110)×10
⇒x=10⇒x=10
Vậy x=10x=10
~ Học tốt ~
1,4 x 100 = 140
25,08 x 10 = 250,8
@Trunglaai?
1,4x 100=140
25,08x 10=250,8