Соедини равные выражения

а)

\(+1\cdot (-3+21)\)	\(3-21\)
\(+1\cdot (3-21)\)	\(-3-21\)
\(+1\cdot (-3-21)\)	\(3+21\)
\(+1\cdot (3+21)\)	\(-3+21\)

\(-3-21\)	\(-1\cdot (3+21)\)
\(3-21\)	\(-1\cdot (3-21)\)
\(3+21\)	\(-1\cdot (-3-21)\)
\(-3+21\)	\(-1\cdot (-3+21)\)

б)

\(+(5-40)\)	\(5+40\)
\(+(-5+40)\)	\(5-40\)
\(+(5+40)\)	\(-5+40\)
\(+(-5-40)\)	\(-5-40\)

\(-5-40\)	\(-(5-40)\)
\(5-40\)	\(-(5+40)\)
\(-5+40\)	\(-(-5+40)\)
\(5+40\)	\(-(-5-40)\)