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7/10 < 9/10
5/10 = 50/100 = 50/100
92/100 > 87/100
8/10 = 80/100 > 29/100
7/10<9/10 92/100>87/100 5/10=50/100 8/10>29/100
Chúc bạn học tốt ^^
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a: \(1\dfrac{9}{10}=1,9\)
\(2\dfrac{66}{100}=2,66\)
\(3\dfrac{72}{100}=3,72\)
\(4\dfrac{999}{1000}=4,999\)
b: \(8\dfrac{2}{10}=8,2\)
\(36\dfrac{23}{100}=36,23\)
\(54\dfrac{7}{100}=54,07\)
\(12\dfrac{254}{1000}=12,254\)
![](https://rs.olm.vn/images/avt/0.png?1311)
b, \(\dfrac{3}{5}\) - \(\dfrac{3}{8}\)
= \(\dfrac{24}{40}\) - \(\dfrac{15}{40}\)
= \(\dfrac{9}{40}\)
c, \(\dfrac{1}{4}\) + \(\dfrac{5}{6}\)
= \(\dfrac{6}{24}\) + \(\dfrac{20}{24}\)
= \(\dfrac{26}{24}\)
= \(\dfrac{13}{12}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a,230+4+3/10+7/100
=230+4+0,3+0,07 ( bạn đổi 3/10 bằng 0,3 và 7/100 bằng 0,07)
=234,37 (bạn cộng phép tính như bình thường)
b,-500+7+9/1000
=500+7+0,009 ( đổi 9/1000 bằng 0,009)
=-492,991 (bạn cộng bình thường)
Bài 2:
a,
29,5:2,36 Ta có 23,6: 2,36=10
29,5-23,6=5,9
23,6:5,9=4
=>5,9:2,36=10:4=2,5
Vậy: 29,5: 2,36=10+2,5=12,5
b,
0,2268:0,18=1,26( câu này tính bình thường)
\(\frac{230+4+3}{10}+\frac{7}{100}-\frac{500+7+9}{1000}\)
=\(\frac{237}{10}+\frac{7}{100}-\frac{516}{1000}\)
=
![](https://rs.olm.vn/images/avt/0.png?1311)
b)\(4\times\dfrac{3}{8}=\dfrac{12}{8}=\dfrac{3}{2}\)
\(3:\dfrac{1}{2}\)
=\(3\times\dfrac{2}{1}\)
= 6
=\(\dfrac{1}{2}:3\)
= \(\dfrac{1}{2}\times\dfrac{1}{3}\)
= \(\dfrac{1}{6}\)
1a, \(\dfrac{3}{10}\) \(\times\) \(\dfrac{4}{9}\)
= \(\dfrac{3\times2\times2}{2\times5\times3\times3}\)
= \(\dfrac{2}{15}\)
\(\dfrac{6}{5}\): \(\dfrac{3}{7}\)
= \(\dfrac{6}{5}\) \(\times\) \(\dfrac{7}{3}\)
= \(\dfrac{14}{5}\)
\(\dfrac{3}{4}\) \(\times\) \(\dfrac{2}{5}\)
= \(\dfrac{3\times2}{2\times2\times5}\)
= \(\dfrac{3}{10}\)
\(\dfrac{5}{8}\) : \(\dfrac{1}{2}\)
= \(\dfrac{5}{8}\) \(\times\) \(\dfrac{2}{1}\)
= \(\dfrac{5}{4}\)
![](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........
\(\frac{7}{10}\)< \(\frac{9}{10}\)
\(\frac{92}{100}\)> \(\frac{87}{100}\)
\(\frac{5}{10}\)= \(\frac{50}{100}\)
\(\frac{8}{10}\)> \(\frac{29}{100}\)
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