Calcul algebric

Multiple Choice

$$2xy+3x^2-7xy-12x^2+3=$$

• $$-9x^2-5xy+3$$

• $$9x^2-5xy+3$$

• $$-9x^2+5xy+3$$

• $$-9x^2-8xy$$

Multiple Choice

$$\left(x^2-\sqrt[]{3}\right)\left(x^2+\sqrt[]{3}\right)=$$

• $$x^2-9$$

• $$x^4+3$$

• $$x^4-3$$

• $$x^4-9$$

Multiple Choice

$$-15x^4y:3x^2y=$$

• $$-5x^4y^2$$

• $$-5x^2y$$

• $$-5x^2$$

• $$5x^2$$

Multiple Choice

Descompuneți în produs de factori expresia: $$64x^4-25y^2=$$

• $$\left(8x^2-5y\right)\left(8x^2+5y\right)$$

• $$\left(8x^{ }-5y\right)\left(8x^{ }+5y\right)$$

• $$\left(8x^2-5y^2\right)\left(8x^2+5y^2\right)$$

• $$\left(8x^{ }-5y^2\right)\left(8x^{ }+5y^2\right)$$

Multiple Choice

$$\left(2x-3\right)^2=$$

• $$4x^2+12x-9$$

• $$4x^2+12x+9$$

• $$4x^2-12x+9$$

• $$2x^2-12x+9$$

Multiple Choice

$$\left(-\frac{2}{3}x^2y^3z\right)^3=$$

• $$-\frac{6}{9}x^6y^9z^3$$

• $$-\frac{6}{9}x^8y^9z^3$$

• $$\frac{8}{27}x^6y^9z^3$$

• $$-\frac{8}{27}x^6y^9z^3$$

Multiple Choice

$$2x^2\cdot3xy=$$

• $$6xy^2$$

• $$6x^3y$$

• $$6xy$$

• $$5x^3y$$