(a²+b²-1)-4a²b²打错了是(a²+b²-1)²-4a²b²
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![(a²+b²-1)-4a²b²打错了是(a²+b²-1)²-4a²b²](/uploads/image/z/2533986-18-6.jpg?t=%28a%26%23178%3B%2Bb%26%23178%3B-1%29-4a%26%23178%3Bb%26%23178%3B%E6%89%93%E9%94%99%E4%BA%86%E6%98%AF%28a%26%23178%3B%2Bb%26%23178%3B-1%29%26%23178%3B-4a%26%23178%3Bb%26%23178%3B)
(a²+b²-1)-4a²b²打错了是(a²+b²-1)²-4a²b²
(a²+b²-1)-4a²b²
打错了是(a²+b²-1)²-4a²b²
(a²+b²-1)-4a²b²打错了是(a²+b²-1)²-4a²b²
(a²+b²-1)²-4a²b²
= (a²+b²-1+2ab) (a²+b²-1-2ab)
= (a²+2ab+b²-1) (a²-2ab+b²-1)
= [(a+b)²-1] [(a-b)²-1]
=(a+b+1)(a+b-1)(a-b+1)(a-b-1)
简单
原式=【(a^2+b^2-1)+2ab] [(a^2+b^2-1)-2ab]
=[(a+b)^2-1】 【(a-b)^2-1】
=(a+b+1) (a+b-1) (a-b+1) (a-b-1)