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a) x + 5,28 = 9,19 b) x - 34,87 = 58,21 c) x + 37,66 = 80,94
x = 9,19 - 5,28 x = 58,21 + 34,87 x = 80,94 - 37,66
x = 3.91 x = 89.08 x = 43,28
a, x+5,28=9,19 c, x+37,66=80,84
x=3,91 x=43,18
b, x-34,87=58,21 d, 76,22-x=38,08
x=93,08 x=38,14
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x + 5,28 =9,19 b)tự học nhé neko bye
x=9,19-5,28
x=3,91
a) \(x+5,28=9,19\)
\(x=9,19-5,28\)
\(x=3,91\)
b) \(x+37,66=80,84\)
\(x=80,84-37,66\)
\(x=43,18\)
c) \(x-34,87=58,21\)
\(x=58,21+34,87\)
\(x=93,08\)
d) \(76,22-x=38,08\)
\(x=76,22-38,08\)
\(x=38,14\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a. y x 4 = 30,2 – 9,4
y x 4 = 20,8
y = 20,8 : 4
y = 5,2
b. y : 9 = 18,7 - 2
y : 9 = 16,7
y = 16,7 x 9
y = 150,3
a) y x 4 = 30,2 - 9,4
y x 4 = 30,2 - 9,4
y x 4 = 20,8
y = 20,8 : 4
y = 5,2
Vậy y = 5,2
b) y : 9 = 18,7 - 2
y : 9 = 18,7 - 2
y : 9 = 16,7
y = 16,7 x 9
y = 150,3
Vậy y = 150,3
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x: 15 - 34,87 = 58,21
x : 15 = 58,21 + 34,87
x: 15 = 93,08
x = 15 x 93,08
x = 1396,2
![](https://rs.olm.vn/images/avt/0.png?1311)
`2,4 xx 25 + 102 xx 9,4 - 9,4 - 9,4`
`=2,4xx25+9,4xx(102-1-1)`
`=2,4xx25+9,4xx100`
`=2,4xx25+940`
`=60+940`
`=1000`
= 2,4 x 25 + ( 102 - 1 - 1) x 9,4
= 2,4 x 25 + 100 x 9,4
= 60 + 940
= 1000
![](https://rs.olm.vn/images/avt/0.png?1311)
101 \(\times\) 9,4 - 9,4 + 25 \(\times\) \(\dfrac{2,4}{250\%}\) \(\times\) 125% \(\times\) 32
= 9,4 \(\times\) ( 101 - 1) + 25 \(\times\) \(\dfrac{2,4}{2,5}\) \(\times\) 125% \(\times\) 8 \(\times\) 4
= 9,4 \(\times\)100 + 25 \(\times\) \(\dfrac{24}{25}\) \(\times\) 10 \(\times\) 4
= 94 \(\times\)10 + 24 \(\times\) 4 \(\times\) 10
= 10 \(\times\) ( 94 + 96)
= 10 \(\times\) 190
= 1900
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính nhẩm 3,45×10 = ............34,5
23,48 ×100 =............2348
9,1234 ×1000= ..........9123,4
4,067 ×10 = ............40,67
0,238×100 =............23,8
0,078 ×1000 = ..........78
0,45 ×10 = ............4,5
4,8 ×100 =............480
9,4×1000 = ..........9400
Bài 9. Tính nhẩm
441,5 ×0,1 = ...........44,15
607,18×0,01 =............6,0718
522,4 ×0,001 = ..........0,5224
14,5 ×0,1 = ............1,45
67,24 ×0,01 =............0,6724
98,01 ×0,001 = ..........0,09801
5,5 ×0,1 = ............0,55
2,4 ×0,01 =............0,024
1,1 ×0,001 = ..........0,0011
Tính nhẩm 3,45×10 = ...34,5.........
23,48 ×100 =.....2348.......
9,1234 ×1000= .....9123,4.....
4,067 ×10 = ....40,67........
0,238×100 =...23,8.........
0,078 ×1000 = ...78.......
0,45 ×10 = .....4,5.......
4,8 ×100 =....480........
9,4×1000 = ....9400......
Bài 9. Tính nhẩm
441,5 ×0,1 = ......44,15......
607,18×0,01 =...6,0718.........
522,4 ×0,001 = ....0,5224......
14,5 ×0,1 = ..1,45..........
67,24 ×0,01 =......0,6724......
98,01 ×0,001 = ..0,9801........
5,5 ×0,1 = ....0,55........
2,4 ×0,01 =...0,024.........
1,1 ×0,001 = ..0,0011........
x=93,08 và x=220,9
x = 58,21 + 34,87
x = 93,08
x : 9,4 = 23,5
x = 220,9