help voi a

a: \(\left(3x+2\right)^2+4x-3x^2+2\left(5x-2\right)\left(5x+2\right)-75x^2\)

\(=9x^2+12x+4+4x-3x^2+50x^2-8-75x^2\)

\(=-19x^2+16x-4\)

a) \(\left(5x+3y\right)\left(5x-3y\right)+\left(4x-3y\right)^2\)

\(=25x^2-9y^2+16x^2-24xy+9y^2\)

\(=41x^2-24xy\)

b) \(\left(2x-3y\right)^3-\left(3x+2y\right)^3\)

\(=8x^3-36x^2y+54xy^2-27xy^2-27x^3-54x^2y-36xy^2-8y^3\)

\(=-19x^3-90x^2y+18xy^2-35y^3\)

\(x^3+3x+7x^3+2x^2+5x+1\)

\(=8x^3+2x^2+8x+1\)

tham khảo nhé~

=(x^3+7x^3)+2x^2+(3x+5x)+1

=8x^3+2x^2+8x+1

Hok tot!!!!

7x³ + x³ + 2x² + 5x + 3x + 1

= (7x³ + x³) + 2x² + (5x + 3x) + 1

= 8x³ + 2x² + 8x + 1

= 2x.(4x² + x + 4) + 1

Chúc em học tốt!!!

A+B

=3x^2y^3-5x^3y^2-5xy+1+5x^3y^2-2x^2y^3-5xy+2

=x^2y^3-10xy+3

A+B = \(\left(3x^2y^3-5x^3y^2-5xy+1\right)+\left(5x^3y^2-2x^2y^3-5xy+2\right)\)

        = \(\left(3x^2y^3-2x^2y^3\right)+\left(-5x^3y^2+5x^3y^2\right)+\left(-5xy-5xy\right)+\left(1+2\right)\)

        = \(x^2y^3-10xy+3\)

Không bíc có đúng không nữa

a: \(\dfrac{9x^3y^2-4xy^2+5x}{2x}=\dfrac{9}{2}x^2y^2-2y^2+\dfrac{5}{2}\)

b: \(\left(\dfrac{3}{4}x^3y^6+\dfrac{6}{5}x^4y^3-\dfrac{9}{10}x^5y\right):\dfrac{-3}{5}x^3y\)

\(=y^5\cdot\left(\dfrac{3}{4}:\dfrac{-3}{5}\right)-xy^2\cdot\left(\dfrac{6}{5}:\dfrac{3}{5}\right)+\dfrac{9}{10}:\dfrac{3}{5}\cdot x^2\)

\(=\dfrac{-5}{4}y^5-2xy^2+\dfrac{3}{2}x^2\)