Question

Помогите с заданием 6 и 7

Answer 1

6.[3(1+√6)-√6(1-√6)]÷(1+√6)(1-√6)·(9-2√6)
=(9+2√6)(9-2√6)÷(1+√6)(1-√6)
=(81-24)÷(1-6)
=-57/5
7.a=2, b=-5,c=1. Δ=b²-4ac=17>0, x=[-b±√(b²-4ac)]/2a
∴x=(5+√17)/4,x=(5-√17)/4