Cho biết:
M + (2x^3 + 3x^2y - 3xy^2 + xy + 1 ) = 3x^2 + 3x^2y - 3xy^2 + xy
a) M=?
b) x=? thì M= -28
Bài 10: Cho biết: M+\((2x^3+3x^2y-3xy^2+xy+1)=3x^3+3x^2y-3xy^2+xy\)
a) Tìm đa thức M
b) Với giá trị nào của x thì M=-28
a/ Ta có :
\(M=3x^3+3x^2y-3xy^2+xy-\left(2x^3+3x^2y-3xy^2+xy+1\right)\)
\(=x^3-1\)
Vậy...
b/ Ta có :
\(M=-28\)
\(\Leftrightarrow x^3-1=-28\)
\(\Leftrightarrow x^3=-27\)
\(\Leftrightarrow x=-3\)
Vậy.....
a/ Ta có :
M=3x3+3x2y−3xy2+xy−(2x3+3x2y−3xy2+xy+1)M=3x3+3x2y−3xy2+xy−(2x3+3x2y−3xy2+xy+1)
=x3−1=x3−1
Vậy...
b/ Ta có :
M=−28M=−28
⇔x3−1=−28⇔x3−1=−28
⇔x3=−27
cho biết
\(M+\left(2x^3+3x^2y-3xy^2+xy-1\right)=3x^3+3x^2y-3xy^2+xy\)
a) tìm đa thức M
b) Vs giá trị nào của x thì m = 9
a) \(M=\left(3x^3+3x^2y-3xy^2+xy\right)-\left(2x^3+3x^2y-3xy^2+xy-1\right)\)
\(M=3x^3+3x^2y-3xy^2+xy-2x^3-3x^2y+3xy^2-xy+1\)
\(M=\left(3x^3-2x^3\right)+\left(3x^2y-3x^2y\right)+\left(3xy^2-3xy^2\right)+\left(xy-xy\right)+1\)\(M=x^3+1\)
b)\(M=9\Leftrightarrow x^3+1=9\)
\(x^3=8\)
\(x^3=2^3\Rightarrow x=2\)
Vậy với x=2 thì M=9
Tìm x
a) x(x^3+3x-4x)-(4x+3x^2)=20
b) (2\3xy-x^2+3xy^3)(2x^2-3xy^2+x^2y)
c) (2xy+3xy^2-x^2y)(xy+x^2y+y^2)
a.4x^2y-3xy^2+xy+xy-x^2y+5xy^2
b.x^2+2y^2+3xy+x^2-3y^2+4xy
c.2x^y-3xy+4xy^2-5x^2y+2xy^2
d.(2x^3+3x^2-4x+1)-(3x+4x^3-5)
Tìm đa thức M biết
a, M - ( x^2y-1) =-2x^3+x^2y+1
b, 3x^2+3xy-x^3-M=3x^2+2xy-4y^2
a) \(M-\left(x^2y-1\right)=-2x^3+x^2y+1\)
\(\Rightarrow M-x^2y+1=-2x^3+x^2y+1\)
\(\Rightarrow M=-2x^3+x^2y+1+x^2y-1\)
\(\Rightarrow M=-2x^3+2x^2y\)
b) \(3x^2+3xy-x^3-M=3x^2+2xy-4y^2\)
\(\Rightarrow-M=3x^2+2xy-4y^2-3x^2-3xy+x^3\)
\(\Rightarrow-M=x^3-4y^2-xy\)
\(\Rightarrow M=-x^3+4y^2+xy\)
a)(2x+5)(4-3x). b)(3xy+2x^2)(-3x^2+xy). C)(-1/2x^2y+6x)(-2x+1/2x^2y)
a: (2x+5)(4-3x)
=8x-6x^2+20-15x
=-6x^2-7x+20
b: (3xy+2x^2)*(-3x^2+xy)
=-9x^3y+3x^2y^2-6x^4+2x^3y
=-7x^3y+3x^2y^2-6x^4
c: (-1/2x^2y+6x)(1/2x^2y-2x)
=-1/4x^4y^2+x^3y+3x^3y-12x^2
=-1/4x^4y^2+4x^3y-12x^2
a) \(\left(2x+5\right)\left(4-3x\right)\)
\(=2x\left(4-3x\right)+5\left(4-3x\right)\)
\(=8x-6x^2+20-15x\)
\(=-6x^2+\left(8x-15x\right)+20\)
\(=-6x^2-7x+20\)
b) \(\left(3xy+2x^2\right)\left(-3x^2+xy\right)\)
\(=3xy\left(-3x^2+xy\right)+2x^2\left(-3x^2+xy\right)\)
\(=-9x^3y+3x^2y^2-6x^4+2x^3y\)
\(=3x^2y^2+\left(-9x^3y+2x^3y\right)-6x^4\)
\(=3x^2y^2-7x^3y-6x^4\)
c) \(\left(-\dfrac{1}{2}x^2y+6x\right)\left(-2x+\dfrac{1}{2}x^2y\right)\)
\(=-\dfrac{1}{2}x^2y\left(-2x+\dfrac{1}{2}x^2y\right)+6x\left(-2x+\dfrac{1}{2}x^2y\right)\)
\(=x^3y-\dfrac{1}{4}x^4y^2-12x^2+3x^3y\)
\(=\left(x^3y+3x^3y\right)-\dfrac{1}{2}x^4y^2-12x^2\)
\(=4x^3y-\dfrac{1}{2}x^4y^2-12x^2\)
Trong phần mềm Toolkit Math
a, Tính. -3,4+1/2:2^3
1/3:(1/2+5/6)-4/5
b, Vẽ đồ thị hàm số:y=-3x, y=2x-1
c, Tính. (3x^2-2x+1)+(5x^2+4x-3)
(2xy^2-x^2y+3xy)-(3xy^2+4x^2y-xy)
a. simplify -3,4+(1/2)/2^3
simplify (1/3)/(1/2+5/6)
b. plot y=-3*x
ploty=2*x-1
Làm tính chia
a, (-2x^5+3x^2-4x^3):2x^2
b, (x^3-2x^2y+3xy^2):[-1/2x]
c, (3x^2y^2+6x^2y^3-12xy):3xy
làm tính chia
a, (-2x^5+3x^2-4x^3):2x^2
b, (x^3-2x^2y+3xy^2):[-1/2X]
C, (3x^2y^2+6x^2y^3-12xy):3xy