化简 (x-3y-4z)² (a-4b)(1/4a²+4b²+ab)
问题描述:
化简 (x-3y-4z)² (a-4b)(1/4a²+4b²+ab)
答
(x-3y-4z)²
=x²+9y²+16z²-6xy-8z+24yz
(a²-4b²)/(a²-4ab+4b²)
=(a+2b)(a-2b)/(a-2b)²
=(a+2b)/(a-2b)