\[\boxed{\mathbf{638.еуроки - ответы\ на\ пятёрку}}\]
\[\textbf{а)}\ S = \frac{1}{2} \cdot 6 \cdot 8 = 24\ см^{2}.\]
\[\textbf{б)}\ S = \frac{1}{2} \cdot 6 \cdot 5 + \frac{1}{2} \cdot 6 \cdot 3 =\]
\[= 15 + 9 = 24\ см^{2}.\]
\[\textbf{в)}\ S = \frac{1}{2} \cdot 6 \cdot 6 - \frac{1}{2} \cdot 6 \cdot 3 =\]
\[= 18 - 9 = 9\ см^{2}.\]
\[\textbf{д)}\ S = 8 \cdot 6 - \frac{1}{2} \cdot 2 \cdot 5 - \frac{1}{2} \cdot 8 \cdot 1 =\]
\[= 48 - 5 - 4 = 39\ см^{2}.\]