(a的2次方+b的2次方)的2次方-4a的2次方b的2次方=(a²+b²+2ab)(a²+b²-2ab)=(a+b)²(a-b)²
解:(a²+b²)²-4a²b²=(a²+b²)²-(2ab)²=(a²+b²+2ab)(a²+b²-2ab)=(a+b)²(a-b)²
解原式=a^4+2a^2b^2+b^4-4a^2b^2 =a^4-2a^2b^2+b^4 =(a^2-b^2)² =(a+b)²(a-b)²