计算:(1)(2x+y+z)(y-2x-z)(2)(a^3n)²÷a^2n•a^n-2

题目

计算:(1)(2x+y+z)(y-2x-z)(2)(a^3n)²÷a^2n•a^n-2

答案

1、
原式=[y+(2x+z)][y-(2x+z)]
=y²-(2x+z)²
=y²-4x²-4xz-z²
2、
原式=a^6n÷a^2n•a^n-2
=a^(6n-2n+n-2)
=a^(5n-2)