若m²-y²=4 求(X+y²)(X-y)²的值
问题描述:
若m²-y²=4 求(X+y²)(X-y)²的值
答
条件应该是
x²-y²=4
要求的应该是(x+y)²(x-y)²
(x+y)²(x-y)²
=[(x+y)(x-y)]²
=(x²-y²)²
=4²
=16