T = e $\cdot$ f

T = a $\cdot$ b

T = $\frac{e\cdot f}{2}$

T = $\frac{a\cdot b}{2}$

K = a + b + c + d

K = 2a + 2b

K = a + 2b

K = 2(a + b)

T = a $\cdot$ a

T = a $\cdot$ b

T = $\frac{a\cdot b}{2}$

T = 2a + 2b

K = 2a + 2b

K = a $\cdot$ 4

K = a $\cdot$ a

K = a + a + a + a

T = a $\cdot$ b

T = 2a + 2b

T = 2(a + b)

T = $a\ \cdot\ m_a$

T = 4 $\cdot$ a

T = a $\cdot$ a

T = $a\ \cdot\ m_a$

T = $\frac{e\ \cdot\ f}{2}$

K = 4 $\cdot$ a

K = a + a + a + a

K = 2a + 2b

K = a + b + a + b

K = a + b + a + b

K = 2(a + b)

K = 2a + 2b

K = $\frac{a\ +\ b}{2}$

T = 4 $\cdot$ a

T = a $\cdot$ a

T = $\frac{a\ \cdot\ a}{2}$

T = $a^2$

K = 2a + 2b

K = a + b + e + f

K = $\frac{e\ \cdot\ f}{2}$

K = 2a + 2b

T = a + b + c + d

T = $a\ \cdot\ b\ \cdot\ c\ \cdot\ d$

T = $\frac{\left(a\ +\ c\right)\ \cdot\ m}{2}$

T = $\left(a\ +\ c\right)\ \cdot\ m$