(1)
(2a²b²c)^4÷(-2ab³c)²
=2^4a^8b^8c^4÷2^2a^2b^6c^2
=2^(4-2)a^(8-2)b^(8-6)c^(4-2)
=2²a^6b²c²
=4a^6b²c²
(2)
[x²*x³*x^4÷(x³)²]÷(x^5÷x³)
=(x^(9-6))²÷(x^(5-3)
=x^6÷x²
=x^(6-2)
=x^4
(3)
4x^5y³÷{x^4 y³÷[x³y÷(x³y²÷2xy²)]}
=4x^5y³÷{x^4 y³÷[x³y÷(½x²)]}
=4x^5y³÷{x^4 y³÷2xy}
=4x^5y³÷½x³y²
=8x²y
x=-½,y=3
原式
=8*1/4*3
=6