原式=(9a²b²*a³-2a²*27a³b^6*1/2b)÷(9a^4b²)
=(9a^5b²-27a^5b^7)÷(9a^4b²)
=9a^5b²÷(9a^4b²)-27a^5b^7÷(9a^4b²)
=a-3ab^5
=10-3×10×(-1)
=10+30
=40
原式=(9a²b²*a³-2a²*27a³b^6*1/2b)÷(9a^4b²)
=(9a^5b²-27a^5b^7)÷(9a^4b²)
=9a^5b²÷(9a^4b²)-27a^5b^7÷(9a^4b²)
=a-3ab^5
=10-3×10×(-1)
=10+30
=40