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1.
\(8\times8=64\)
\(6\times4=24\)
\(4\times4=16\)
2.
Ta có:
\(4\times6=24\) \(7\times5=35\)
Vì \(24< 35\) nên \(4\times6< 7\times5\)
Vậy...
_____
Ta có:
\(5\times7=35\) \(8\times9=72\)
Vì \(35< 72\) nên \(5\times7< 8\times9\)
Vậy....
_____
Ta có:
\(3\times5=15\) \(6\times9=54\)
Vì \(15< 54\) nên \(3\times5< 6\times9\)
Vậy...
\(#Wendy.Dang\)
8 x 8 =64
6 x 4 =24
4 x 4=16
Bài 2 : < , > , =
4 x 6 < 7 x 5
5 x 7 < 8 x 9
3 x 5 < 6 x 9
![](https://rs.olm.vn/images/avt/0.png?1311)
1x2= 2 1x2x3=6 1x2x3x4=24 1x2x3x4x5=120 1x2x3x4x5x6=720 1x2x3x4x5x6x7=5040
1x2x3x4x5x6x7x8=40320 1x2x3x4x5x6x7x8x9=362880 1x2x3x4x5x6x7x8x9x10=3628800
1 x 2 = 2
1 x 2 x 3 = 6
1 x 2 x 3 x 4 = 24
1 x 2 x 3 x 4 x 5 = 120
1 x 2 x 3 x 4 x 5 x 6 = 720
1 x 2 x 3 x 4 x 5 x 6 x 7 = 5040
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 = 40320
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 = 362880
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 = 3628800
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{5}{6}\times x=\frac{6}{5}\)
\(x=\frac{6}{5}:\frac{5}{6}\)
\(x=\frac{6}{5}\times\frac{6}{5}\)
\(x=\frac{6\times6}{5\times5}\)
\(x=\frac{36}{25}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 25 : 5 = 5
b) 5 + 4 = 9
c) 66 - x = 6x6
66 - x = 36
x = 66 - 36
x = 30
d) 55 - x = 5x7
55 - x = 35
x = 55 - 35
x = 20
a,x:5=5
x=5x5
x=25
b,5+x=9
x=9-5
x=4
c,66-x=6x6
66-x=36
x=66-36
x=30
d,55-x=5x7
55-x=35
x=55-35
x=20
![](https://rs.olm.vn/images/avt/0.png?1311)
5 x 6 x 7
= 30 x 7
= 210
5x6x7= 210
tk nha , mk nhanh nhất