Соедини равные выражения

а)

\(5\cdot (-3+21)\)	\(-5\cdot 3+5\cdot 21\)
\(5\cdot (3+21)\)	\(-5\cdot 3-5\cdot 21\)
\(5\cdot (3-21)\)	\(5\cdot 3+5\cdot 21\)
\(5\cdot (-3-21)\)	\(5\cdot 3-5\cdot 21\)

\(-5\cdot 3+5\cdot 21\)	\(-5\cdot (-3+21)\)
\(5\cdot 3-5\cdot 21\)	\(-5\cdot (3-21)\)
\(-5\cdot 3-5\cdot 21\)	\(5\cdot (-3-21)\)
\(5\cdot 3+5\cdot 21\)	\(-5\cdot (-3-21)\)

б)

\(-2\cdot (5+40)\)	\(-2\cdot 5-2\cdot 40\)
\(-2\cdot (-5+40)\)	\(2\cdot 5-2\cdot 40\)
\(-2\cdot (-5-40)\)	\(2\cdot 5+2\cdot 40\)
\(-2\cdot (5-40)\)	\(-2\cdot 5+2\cdot 40\)

\(-2\cdot 5-2\cdot 40\)	\(2\cdot (-5-40)\)
\(-2\cdot 5+2\cdot 40\)	\(2\cdot (5+40)\)
\(2\cdot 5-2\cdot 40\)	\(2\cdot (5-40)\)
\(2\cdot 5+2\cdot 40\)	\(2\cdot (-5+40)\)