( -3a ) •a +(-4a) •a -(5a ) .( -3a ) ·a +(-4a) ·a -(5a ) .

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( -3a ) •a +(-4a) •a -(5a ) .( -3a ) ·a +(-4a) ·a -(5a ) .
( -3a ) •a +(-4a) •a -(5a ) .
( -3a ) ·a +(-4a) ·a -(5a ) .

( -3a ) •a +(-4a) •a -(5a ) .( -3a ) ·a +(-4a) ·a -(5a ) .
-7a方-5a (平方不会打)