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a) 4 x 2 + 4 x 3 + 4 x 4 + 4
= 4 x ( 2 + 3 + 4 + 1 )
= 4 x 10
= 40
b) 5 x 23 - 5 x 2 - 5 x 3 - 5 x 4 - 5 x 5 + 5
= 5 x ( 23 - 2 - 3 - 4 - 5 + 5 )
= 5 x 14
= 70
a)4x(1+2+3+4)
=4x10
=40
b)5x23—5x2—5x3—5x4—5x5+5
=5x(23—2—3—4—5+1)
=5x10
=50
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a) \(2+2+2+2+2=2\times5=10\)
\(2\times5=10\)
\(5+5=2\times5=10\)
\(5\times2=10\)
b) \(3\times5=3+3+3+3+3=15\)
\(5\times3=5+5+5=15\)
\(3\times5=5+5+5=15\)
\(5\times3=3+3+3+3+3=15\)
a) 2 + 2 + 2 + 2 + 2 = 10
2 x 5 = 10
5 + 5 = 10
5 x 2 = 10
b) 3 x 5 = 3 + 3 + 3 + 3 + 3 = 15
5 x 3 = 5 + 5 + 5 = 15
3 x 5 = 15
5 x 3 = 15
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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)
3 x 4 = 12 3 x 5 = 15
4 x 7 = 28 5 x 4 = 20
15 : 3 = 5 24 : 4 = 6
5 x 6 = 30 5 x 9 = 45
25 : 5 = 5
3 × 4 = 12 3 × 5 = 15
4 × 7 = 28 5 × 4 = 20
15 ∶ 3 = 5 24 ∶ 4 = 6
5 × 6 = 30 5 × 9 = 45
× 25 ∶ 5 = 5
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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
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`687 + (2 × 5) + 10`
`= 687 + 10 + 10`
`= 697 + 10`
`= 707`
X + 5 = 7
X = 7 - 5
X = 2
Vậy X = 2
x + 5 = 7
= 7 - 5
= 2
Vay x = 2