Tính: 3x + 3x+1 + 3x+2 + 3x+3 + 3x+4 = 3267
Những câu hỏi liên quan
Tính :
1) 4(3x+4)
2) 4/3(5/3x+6)
3)(4/3x+7).5+2
4)(3/7x-6).(-7)+3x
1, 4[3x + 4] = 12x + 16
2, 4/3[5/3x + 6] = 20/9x + 12
3, [4/3x + 7]. 5 + 2 = 20/3x + 35 + 2 = 20/3x + 37
4, [3/7x - 6][-7] + 3x = -3x + 42 + 3x = 42
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tính
\(\dfrac{x^2+38x+4}{2x^2+17x+1}-\dfrac{3x^2-4x-2}{2x^2+17x+1}\)
\(\dfrac{3x+1}{3x^2-3x+1}+\dfrac{x^2-6x}{x^2-3x+1}\)
\(\dfrac{-x}{3x-2}+\dfrac{7x-4}{3x-2}\)
a) Ta có: \(\dfrac{x^2+38x+4}{2x^2+17x+1}-\dfrac{3x^2-4x-2}{2x^2+17x+1}\)
\(=\dfrac{x^2+38x+4-3x^2+4x+2}{2x^2+17x+1}\)
\(=\dfrac{-2x^2+42x+6}{2x^2+17x+1}\)
c) Ta có: \(C=\dfrac{-x}{3x-2}+\dfrac{7x-4}{3x-2}\)
\(=\dfrac{-x+7x-4}{3x-2}\)
\(=\dfrac{6x-4}{3x-2}=2\)
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Tính :
B=(x-3)3-(x+3).(x2-3x+9)+(3x-1).(3x+1)
C=(3x+2)3-18x.(3x+2)+(x-1)3-28x3+3x.(x-1)
\(B=\left(x-3\right)^3-\left(x+3\right)\left(x^2-3x+9\right)+\left(3x-1\right)\left(3x+1\right)\)
\(B=x^3-9x^2+27x-27-\left(x^3-3x^2+9x+3x^2-9x+27\right)+\left(9x^2-1\right)\)
\(B=x^3-9x^2+27x-27-\left(x^3+27\right)+9x^2-1\)
\(B=x^3-9x^2+27x-27-x^3-27+9x^2-1\)
\(B=27x-55\)
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cho hai đa thức : P(x) = 2x^4 + 3x^3 + 3x^2 - x^4 - 4x + 2 - 2x^2 + 6x và Q(x) = x^4 + 3x^2 + 5x - 1 - x^2 - 3x + 2 + x^3 . tính P(x) + Q(x) .
`P(x)=`\( 2x^4 + 3x^3 + 3x^2 - x^4 - 4x + 2 - 2x^2 + 6x\)
`= (2x^4-x^4)+3x^3+(3x^2-2x^2)+(-4x+6x)+2`
`= x^4+3x^3+x^2+2x+2`
`Q(x)=`\(x^4 + 3x^2 + 5x - 1 - x^2 - 3x + 2 + x^3\)
`= x^4+x^3+(3x^2-x^2)+(5x-3x)+(-1+2)`
`= x^4+x^3+2x^2+2x+1`
`P(x)+Q(x)=(x^4+3x^3+x^2+2x+2)+(x^4+x^3+2x^2+2x+1)`
`=x^4+3x^3+x^2+2x+2+x^4+x^3+2x^2+2x+1`
`=(x^4+x^4)+(3x^3+x^3)+(x^2+2x^2)+(2x+2x)+(2+1)`
`= 2x^4+4x^3+3x^2+4x+3`
`@`\(\text{dn inactive.}\)
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P(x)=x^4+3x^3+x^2+2x+2
Q(x)=x^4+x^3+2x^2+2x+1
P(x)+Q(x)=2x^4+4x^3+3x^2+4x+3
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P(x) = 2x4 + 3x3 + 3x2 - x4 - 4x + 2 - 2x2 + 6x
Q(x) = x4 + 3x2 + 5x - 1 - x2 - 3x + 2 + x3
P(x)+Q(x) = 2x4 + 3x3 + 3x2 - x4 - 4x + 2 - 2x2 + 6x + x4 + 3x2 + 5x - 1 - x2 - 3x + 2 + x3
P(x)+Q(x) = (2x4-x4+x4) + (3x3+x3) + (3x2-2x2+3x2-x2) - (4x-6x-5x+3x) +(2-1+2)
P(x)+Q(x) = 4x3+3x2-4x+3
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*Dạng 2: Đa thức BT1: Thực hiện phép tính a) 3x(x^2-5x+7) b) (x+4)(-x^2+6x+5) c) (3x-1)(3x+5)-7(x^2+2) d) (-5x^5 + 2x^4 - 1/3x^3): (-1/2x^3)
a: =3x^3-15x^2+21x
b: =-x^3+6x^2+5x-4x^2-24x-20
=-x^3+2x^2-19x-20
c: =9x^2+15x-3x-5-7x^2-14
=2x^2+12x-19
d: =10x^2-4x+2/3
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Rút gọn :
1. (2x-5)(3x+1)-(x-3)^2+(2x+5)^2-(3x+1)^3
2. (2x-1)(2x+1)-3x-2)(2x+3)-(x-1)^3+(2x+3)^3
3. (x-2)(x^2+2x+4)-(3x-2)^3+(3x-4)^2
4. (7x-1)(8x+2)-(2x-7)^2-(x-4)^3-(3x+1)^3
5. (5x-1)(5x+1)-(x+3)(x^2-3x+9)-(2x+4)^2-(3x-4)^2+(2x-5)^3
6. (4x-1)(x+2)-(2x+5)^2-(3x-7)^2+(2x+3)^3=(3x-1)^3
1: \(=6x^2+2x-15x-5-x^2+6x-9+4x^2+20x+25-27x^3-27x^2-9x-1\)
=-27x^3-18x^2+4x+10
2: =4x^2-1-6x^2-9x+4x+6-x^3+3x^2-3x+1+8x^3+36x^2+54x+27
=7x^3+37x^2+46x+33
5:
\(=25x^2-1-x^3-27-4x^2-16x-16-9x^2+24x-16+\left(2x-5\right)^3\)
\(=8x^3-60x^2+150-125+12x^2-x^3+8x-60\)
=7x^3-48x^2+8x-35
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B1 :Tính
a) (6x^4 - 4x^2 + 3x -2) : (3x - 2)
b) (6x^3 +3x^2 +4x+2) : (3x^2+2)
c) (x^5 +4x^3 +3x^2 - 5x +15 ): ( x^3 -x +3
1.Tính :
a) x^3 - 3x^2 - 9x + 27
b) ( 3x - 2 )( 3x + 2 ) - ( 4 - 3x )^2
2. Tìm x :
( 2x + 5 )^2 - ( 1 + 2x )( 2x - 1 ) = -3
\(x^3-3x^2-9x+27=x^2\left(x-3\right)-9\left(x-3\right)=\left(x-3\right)\left(x^2-9\right)=\left(x-3\right)\left(x-3\right)\left(x+3\right)=\left(x-3\right)^2\left(x+3\right)\)
\(\left(3x-2\right)\left(3x+2\right)-\left(4-3x\right)^2=9x^2-4-16+24x-9x^2=24x-20=4\left(6x-5\right)\)
\(\left(2x+5\right)^2-\left(1+2x\right)\left(2x-1\right)=-3\)
\(4x^2+20x+25-4x^2+1=-3\)
\(20x=-3-25-1\)
\(20x=-29\)
\(x=-\frac{29}{20}\)
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Thực hiện phép tính: a) 5x²(3x²-7x+2) b) (x+3)(x²-1) c) 3x.(x²+3x-4)
a) \(5x^2\left(3x^2-7x+2\right)\)
\(=5x^2.3x^2+5x^2.\left(-7x\right)+5x^2.2\)
\(=\left(5.3\right)\left(x^2.x^2\right)+\left[5.\left(-7\right)\right].\left(x^2.x\right)+\left(5.2\right).x^2\)
\(=15x^{2+2}+\left(-35\right).x^{2+1}+10.x^2\)
\(=15x^4-35x^3+10x^2\)
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3x^2(x^3-3x^2+1)
=3x^2.x^3+3x^2.(-3x^)+3x^2.1
=3x^5-9x^4+3x^2
mấy bạn ơi sao ra 3x^5-9x^4 vậy chỉ mk với mình cần gấp ạ
