2x3=... 8-4=... 4x10=...
5x1=... 2x9=... 5x2=...
Tính nhanh a) 4x5-4x2+8 b) 2x3+9+3x3. c) 2+2x9
a) 4 x 5 - 4 x 2 + 4
= 4 x 5 - 4 x 2 + 4 x 1
= 4 x ( 5 - 2 + 1 )
= 4 x 4
= 16
b) 2 x 3 + 9 + 3 x 3
= 2 x 3 + 3 x 3 + 3 x 3
= 3 x ( 2 + 3 + 3 )
= 3 x 8
= 24
c) 2 + 2 x 9
= 2 x 1 + 2 x 9
= 2 x ( 1 + 9 )
= 2 x 10
= 20
a) 4 x 5 - 4 x 2 + 4
= 4 x 5 - 4 x 2 + 4 x 1
= 4 x ( 5 - 2 + 1 )
= 4 x 4
= 16
b) 2 x 3 + 9 + 3 x 3
= 2 x 3 + 3 x 3 + 3 x 3
= 3 x ( 2 + 3 + 3 )
= 3 x 8
= 24
c) 2 + 2 x 9
= 2 x 1 + 2 x 9
= 2 x ( 1 + 9 )
= 2 x 10
= 20
Đáp án đây nhé
x^2-5x+4=0 A= 5x1-x2/x1 - x1-5x2/x2 giúp tớ
\(A=\dfrac{5x_1-x_2}{x_1}+\dfrac{5x_2-x_1}{x_2}\)
\(=\dfrac{5x_1\cdot x_2-x_2^2+5x_1x_2-x_1^2}{x_1x_2}\)
\(=\dfrac{10x_1x_2-\left[\left(x_1+x_2\right)^2-2x_1x_2\right]}{x_1x_2}\)
\(=\dfrac{10\cdot4-\left[5^2-2\cdot4\right]}{4}=\dfrac{40-25+8}{4}=\dfrac{23}{4}\)
tính giá trị biểu thứcB=x5-5x4+5x3-5x2+5x1 khi x=4
\(A=x^5-5x^4+5x^3-5x^2+5x\)
\(=x^5-\left(x+1\right)x^4+\left(x+1\right)x^3-\left(x+1\right)x^2+\left(x+1\right)x\)
\(=x^5-x^5-x^4+x^4+x^3-x^3-x^2+x^2+x\)
\(=x\)
\(=4\)
2x1= 3x1= 4x1= 5x1= 2:2= 3:3= 4:4= 5:5=
2x2= 3x2= 4x2= 5x2= 4:2= 6:3= 8:4= 10:5=
2x3= 3x3= 4x3= 5x3= 6:2= 9:3= 12:4= 15:5=
2x4= 3x4= 4x4= 5x4= 8:2= 12:3= 16:4= 20:5=
2x5= 3x5= 4x5= 5x5= 10:2= 15:3= 20:4= 25:5=
2x6= 3x6= 4x6= 5x6= 12:2= 18:3= 24:4= 30:5=
2x7= 3x7= 4x7= 5x7= 14:2= 21:3= 28:4= 35:5=
2x8= 3x8= 4x8= 5x8= 16:2= 24:3= 32:4= 40:5=
2x9= 3x9= 4x9= 5x9= 18:2= 27:3= 36:9= 45:5=
2x10= 3x10= 4x10= 5x10= 20:2= 30:3= 40:4= 50:5=
Help!
2 x 1 = 2 | 3 x 1 = 3 | 4 x 1 = 4 | 5 x 1 = 5 |
2 x 2 = 4 | 3 x 2 = 6 | 4 x 2 = 8 | 5 x 2 = 10 |
2 x 3 = 6 | 3 x 3 = 9 | 4 x 3 = 12 | 5 x 3 = 15 |
2 x 4 = 8 | 3 x 4 = 12 | 4 x 4 = 16 | 5 x 4 = 20 |
2 x 5 = 10 | 3 x 5 = 15 | 4 x 5 = 20 | 5 x 5 = 25 |
2 x 6 = 12 | 3 x 6 = 18 | 4 x 6 = 24 | 5 x 6 = 30 |
2 x 7 = 14 | 3 x 7 = 21 | 4 x 7 = 28 | 5 x 7 = 35 |
2 x 8 = 16 | 3 x 8 = 24 | 4 x 8 = 32 | 5 x 8 = 40 |
2 x 9 = 18 | 3 x 9 = 27 | 4 x 9 = 36 | 5 x 9 = 45 |
2 x 10 = 20 | 3 x 10 = 30 | 4 x 10 = 40 | 5 x 10 = 50 |
2x1=2 3x1=3 4x1=4 5x1=5 2:2= 1 3:3= 1 4:4=1 5:5=1
2x2= 4 3x2=6 4x2= 8 5x2=10 4:2= 2 6:3= 2 8:4=2 10:5=2
2x3=6 3x3= 9 4x3=12 5x3=15 6:2=3 9:3= 3 12:4=3 15:5=3
2x4=8 3x4=12 4x4=16 5x4=20 8:2=4 12:3=4 16:4=4 20:5=4
2x5=10 3x5= 15 4x5= 20 5x5= 25 10:2=5 15:3= 5 20:4=5 25:5=5
2x6=12 3x6=18 4x6= 24 5x6=30 12:2=6 18:3= 6 24:4=6 30:5=6
2x7= 14 3x7=21 4x7= 28 5x7=35 14:2=7 21:3=7 28:4=7 35:5=7
2x8=16 3x8=24 4x8= 32 5x8=50 16:2=8 24:3=8 32:4=8 40:5=8
2x9= 18 3x9= 27 4x9= 36 5x9=45 18:2=9 27:3= 9 36:9=9 45:5=9
2x10=20 3x10=30 4x10= 40 5x10=50 20:2=10 30:3=10 40:4= 10 50:5=10
Phân tích
a,(x2 + x + 2)3 - (x+1)3 = x6 +1 b,(x2 + 10x + 8)2 - (8x + 4)(x2 + 8x+7)
c, A= x4 + 2x3 + 3x2 + 2x+4 d,B= x4 + 4x3 + +8x2 + 8x + 4
e, C= x4 - 2x3 + 5x2 - 4x + 4
1. (x3 – 3x2 + x – 3) : (x – 3) 2. (2x4 – 5x2 + x3 – 3 – 3x) : (x2 – 3) 3. (x – y – z)5 : (x – y – z)3 4. (x2 + 2x + x2 – 4) : (x + 2) 5. (2x3 + 5x2 – 2x + 3) : (2x2 – x + 1) 6. (2x3 – 5x2 + 6x – 15) : (2x – 5)
1: \(=x^2+1\)
3: \(=\left(x-y-z\right)^2\)
5x1=?
5x2=?
5x3=?
5 x 1 = 5
5 x 2 = 10
5 x 3 = 15
k mik nha bn
thank you very much
5x1=5
5x2=10
5x3=15
TK MÌNH NHÉ , THANK
CHÚC BẠN NĂM MỚI VUI VẺ , HỌC GIỎI , HẠNH PHÚC
Cứu với ạ
Làm tính chia
1) (x3 – 3x2 + x – 3) : (x – 3) 2) (2x4 – 5x2 + x3 – 3 – 3x) : (x2 – 3)
3) (x – y – z)5 : (x – y – z)3 4) (x2 + 2x + x2 – 4) : (x + 2)
5) (2x3 + 5x2 – 2x + 3) : (2x2 – x + 1) | 6) (2x3 – 5x2 + 6x – 15):(2x – 5) |
Thực hiện phép chia:
1. (-3x3 + 5x2 - 9x + 15) : ( 3x + 5)
2. ( 5x4 + 9x3 - 2x2 - 4x - 8) : ( x-1)
3. ( 5x3 + 14x2 + 12x + 8 ) : (x + 2)
4. ( x4 - 2x3 + 2x -1 ) : ( x2 - 1)
5. ( 5x2 - 3x3 + 15 - 9x ) : ( 5 - 3x)
6. ( -x2 + 6x3 - 26x + 21) : ( 3 -2x )
1: Sửa đề: 3x-5
\(=\dfrac{-x^2\left(3x-5\right)-3\left(3x-5\right)}{3x-5}=-x^2-3\)
2: \(=\dfrac{5x^4-5x^3+14x^3-14x^2+12x^2-12x+8x-8}{x-1}\)
=5x^2+14x^2+12x+8
3: \(=\dfrac{5x^3+10x^2+4x^2+8x+4x+8}{x+2}=5x^2+4x+4\)
4: \(=\dfrac{\left(x^2-1\right)\left(x^2+1\right)-2x\left(x^2-1\right)}{x^2-1}=x^2+1-2x\)
5: \(=\dfrac{x^2\left(5-3x\right)+3\left(5-3x\right)}{5-3x}=x^2+3\)