$$\frac{2x - 1}{x\left(x + 2\right)^2\left(x - 4\right)}$$

$$4x^3 - 8x^2$$

$$7m\,6n\,\left(-1.3p\right)$$

$$\left(x - 1\right)\left(x + 2\right)\left(x- 3\right)$$

$$15m + 5n\,m + 35p\,m$$

$$x^3 + 4x^2 + x - 6$$

$$\left(\frac{4a^2}{\left(2a - b\right)}\right):\left(\frac{12a^3}{\left(4a^2 - b^2\right)}\right):\left(\frac{2a^2}{\left(6a^2 - 3ab\right)}\right)$$

$$6008$$

$$\cos{\left(x+y\right)}$$

$$\cos{\left(x\right)}\cos{\left(y\right)} - \sin{\left(x\right)}\sin{\left(y\right)}$$

$$\cos{\left(\pi-x\right)}$$

$$\frac{1}{2}-\frac{\cos{\left(2p\right)}}{2}$$

$$\cos{\left(x\right)} - \sin{\left(x\right)}$$

$$\sin{\left(x\right)} + \cos{\left(x\right)}$$

$$1 - \frac{1}{4}\sin{\left(2x\right)}^2 - \sin{\left(y\right)}^2 - \cos{\left(x\right)}^4$$

$$\cos{\left(x\right)}\cos{\left(2x\right)}$$

$$\cos{\left(x\right)} + \cos{\left(y\right)}$$

$$x^2 - 36$$

$$4x^2 - 81$$

$$2\left(9x^2 - 49y^2\right)$$

$$9x\left(x^2 - 9\right)$$

$$16x^4 - 1$$

$$x^3 - 8$$

$$27x^3 - 125$$

$$64x^3 - 343y^3$$

$$2\left(8x^3 - 27y^3\right)$$

$$x^3 + 64$$

$$8x^3 + 125$$

$$125x^3 + 216y^3$$

$$3\left(27x^3 + 64y^3\right)$$

$$x^2 + x - 6$$

$$2x^2 - 9x - 5$$

$$x^2 - 9$$

$$\frac{5a^2+3a-2}{a^2-1}$$

$$\frac{x^2+3x-4}{x+4}$$

$$\frac{a}{\left(a+c\right)}\,\left(a+c/c+a+c/a\right)$$

2,3кг + 750г + 500г

1.25кг + 375г + 550г

$$2\left(3y - y - 1\right) + 7\left(5x + 14\right)$$

$$5\left(12a + 5b - 3\right) - 2\left(11a + 7b - 14\right)$$

$$x^2 + x + 1$$

$$5m^2 -3m\,n - 2n^2$$

$$81y^2 + 16t^2 - 72y\,t$$

$$25x^2 - 20x\,y + 4y^2$$

$$\frac{2}{3} + \frac{1}{6}$$

$$\frac{3}{15} + \frac{4}{18}$$

$$\cos{\left(x\right)} - \sin{\left(x\right)}$$

$$\frac{1}{\left(x+1\right)} - \frac{1}{x}$$

5*k+k если k=1/4

$$3x^2\,y + 12x^2 - 3y - 12$$

$$\frac{2}{5} \, \frac{3}{4}$$

$$\frac{11}{4} \, \frac{47}{14}$$

$$\frac{3}{5} - \frac{1}{2}$$

$$\frac{5}{12} - \frac{1}{12}$$

$$\frac{8}{36}$$

680 и 612

2/25 и 3/75

3/5 и 2/15

5/12 и 3/8

-5/19 и -2/9

$$17\,\frac{3}{5}$$

$$\frac{28}{13}$$

0.125

0.136(6)

3.14159

$$\frac{\left(23!-20!\right)}{\left(15!-13!\right)}$$

$$\frac{n!}{\left(n-1\right)!}$$

$$\frac{\left(\left(n + 2\right)! - n!\right)}{\left(\left(n+1\right)! - \left(n-1\right)!\right)}$$

13км 760м + 5км 330м

2мин 40сек + 5мин 48сек + 3мин 32сек

$$81026$$

$$\frac{\left(x^2 - 1\right)}{\left(x^3 + 1\right)}$$

$$\frac{\sqrt{\left(x\right)}}{\left(x + 1\right)}$$

$$\frac{\sqrt[3]{\left(x\right)}}{\left(3x + 2\right)}$$

$$2\sin{\left(x\right)}\cos{\left(x\right)}$$

$$x\,\arcsin{\left(x\right)}$$

$$x\,\arccos{\left(x\right)}$$

$$x\,log{\left(x, 10\right)}$$

$$\frac{\ln{\left(x\right)}}{x}$$

$$\exp{\left(x\right)}\,x$$

$$\tg{\left(x\right)}\,\sin{\left(x\right)}$$

$$\ctg{\left(x\right)}\,cos{\left(x\right)}$$

$$\frac{\left(\sqrt{\left(x\right)} - 1\right)}{\sqrt{\left(x^2 - x - 1\right)}}$$

$$x\,arctg{\left(x\right)}$$

$$x\,\arcctg{\left(x\right)}$$

$$2\sh{\left(x\right)}\ch{\left(x\right)}$$

$$\frac{\operatorname{ctgh}{\left(x\right)}}{\operatorname{tgh}{\left(x\right)}}$$

$$x^2\,\operatorname{arcsinh}{\left(x\right)}\operatorname{arccosh}{\left(x\right)}$$

$$x^2\,\operatorname{arctgh}{\left(x\right)}\operatorname{arcctgh}{\left(x\right)}$$