7x^2-6^(1/2)x-5=0 怎么解
问题描述:
7x^2-6^(1/2)x-5=0 怎么解
答
7x²-√6x=5
x²-√6x/7=5/7
x²-√6x/7+6/196=5/7+6/196=146/196
(x-√6/14)²=(±√146/14)²
x-√6/14=±√146/14
x=(√6-√146)/14,x=(√6+√146)/14