x^2-5x-4=0用分解因式解!要过程!

2024-11-29 17:13:41
推荐回答(1个)
回答1:

x²-5x=4
x²-5x+25/4=41/4
(x-5/2)²=41/4
x=5/2+√41/2 x=5/2-√41/2