(a²-b²)²+(a²+2b²)² 计算

问题描述:

(a²-b²)²+(a²+2b²)² 计算

(a²-b²)²+(a²+2b²)²
=a^4-2a²b²+b^4+a^4+4a²b²+4b^4
=2a^4+2a²b²+5b^4