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1234 > 999
35 784 < 35 790
8754 < 87 540
92 501 > 92 410
39 680 = 39000 + 680
17 600 = 17000 + 600
![](https://rs.olm.vn/images/avt/0.png?1311)
1234 > 999
35 784 < 35 790
8754 < 87 540
92 501 > 92 410
39 680 = 39000 + 680
17 600 = 17000 + 600
![](https://rs.olm.vn/images/avt/0.png?1311)
7x1x7=49
7x2x7=98
7x3x7=147
7x4x7=196
7x5x7=245
7x6x7=294
7x7x7=343
7x8x7=392
7x9x7=441
7x10x7=490
7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
7 x 6 = 42
7 x 7 = 49
7 x 8 = 56
7 x 9 = 63
7 x 10 = 70.
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{2}{5}+\dfrac{3}{7}=\dfrac{14}{35}+\dfrac{15}{35}=\dfrac{29}{35}\)
\(\dfrac{1}{7}+\dfrac{3}{7}+\dfrac{4}{7}=\left(\dfrac{1}{7}+\dfrac{3}{7}\right)+\dfrac{4}{7}=\dfrac{1}{7}+\left(\dfrac{3}{7}+\dfrac{4}{7}\right)=\left(\dfrac{1}{7}+\dfrac{4}{7}\right)+\dfrac{3}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
7+7+.......+7+7 có 11 số hạng tức là bằng 7 x 11.
7 x 11 = 77.
77 - 77 = 0
![](https://rs.olm.vn/images/avt/0.png?1311)