( )÷(-2a²)=-2+3a-4a²+5a³

( )÷(-2a²)=-2+3a-4a²+5a³
( )÷(-2a²)=-2+3a-4a²+5a³

( )÷(-2a²)=-2+3a-4a²+5a³
( )÷(-2a²)=-2+3a-4a²+5a³
所以( )=(-2a²)（-2+3a-4a²+5a³）
=4a²-6a³+8a^4-10a^5

( 4a²-6a³+8a^4-10a^5)÷(-2a²)=-2+3a-4a²+5a³

(4a²-6a³+8a^4-10a^5 )÷(-2a²)=-2+3a-4a²+5a³
(-2+3a-4a²+5a³)x(-2a²)=4a²-6a³+8a^4-10a^5
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