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Ta có :
\(A=x^6+y^6\)
\(=\left(x^2\right)^3+\left(y^2\right)^3\)
\(=\left(x^2+y^2\right)\left(x^4-x^2y^2+y^4\right)\)
\(=x^4-x^2y^2+y^4\)
\(=\left(x^4+2x^2y^2+y^4\right)-3x^2y^2\)
\(=\left(x^2+y^2\right)^2-3x^2y^2\)
\(=1-3x^2y^2\)
Lại có : \(-3x^2y^2\le0\forall x\Rightarrow1-3x^2y^2\le1\forall x\)
Vậy giá trị lớn nhất của A là 1
Dấu "=" xảy ra khi \(x=0\)hoặc \(y=0\).
![](https://rs.olm.vn/images/avt/0.png?1311)
a,x+7=19-1
x+7=18
x =18-7
x =11.
b,x+6=48-19
x+6 =29
x =29-6
x =23.
c,x+34=23+22
x+34 =45
x =45-34
x =11.
d,x+23=86-15
x+23 =71
x =71-23
x =48.
y+7=19-1
y+7=18
y=18-7
y=11
x+6=48-19
x+6=29
x=29-6
x=23
y+34=23+22
y+34=55
y=55-34
y=21
x+23=86-15
x+23=71
x=71-23
x=48
bạn ơi k cho mình với
![](https://rs.olm.vn/images/avt/0.png?1311)
y x 2 + y x 4 + y x 6 = 120
y x ( 2+ 4 + 6 ) = 120
y x 8 = 120
y = 120 : 8
y = 15
y x 2 + y x 4 + y x 6 = 120
y x ( 2 + 4 + 6 ) = 120
y x 12 = 120
y = 120 / 12
y = 10
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(x+5=6-x\)
\(\Leftrightarrow x+x=6-5\)
\(\Leftrightarrow2x=1\)
\(\Leftrightarrow x=1:2\)
\(\Leftrightarrow x=\frac{1}{2}\)
Vậy \(x=\frac{1}{2}.\)
b) \(23-x=11+x\)
\(\Leftrightarrow23-11=x+x\)
\(\Leftrightarrow12=2x\)
\(\Leftrightarrow x=12:2\)
\(\Leftrightarrow x=6\)
Vậy \(x=6.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 34 = 56 - 6
x + 34 = 50
x = 50 - 34
x = 16
y + 56 = 78 + 4
y + 56 = 82
y = 82 - 56
y = 26
x + 32 = 345
x = 345 - 32
x = 313
y + 67 - 6 = 89 - 0
y + 67 - 6 = 89
y + 67 = 89 + 6
y + 67 = 95
y = 95 - 67
y = 28
x + 34 = 56 - 6
x + 34 = 50
x = 50 - 34
x = 16
y + 56 = 78 + 4
y + 56 = 82
y = 82 - 56
y = 26
x + 32 = 345
x = 345 - 32
x = 313
y + 67 - 6 = 89 - 0
y + 67 - 6 = 89
y + 67 = 89 + 6
y + 67 = 95
y = 95 - 67
y = 28
![](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)
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
KO BÍT
tim x
x=?
65-x=47
x=47-65
x=?