Cho E = { x∈R | 1 ≤ x < 7}
A= { x∈R | (x2-9)(x2 – 5x – 6) = 0 }
B = { x∈R | x là số nguyên tố ≤ 5}
a) Chứng minh rằng B ⊂ E
b) Tìm CEB;CE(A∩B)
https://hoc24.vn/cau-hoi/cho-e-xr-1-x-7a-xr-x2-9x2-5x-6-0-b-xr-x-la-so-nguyen-to-5a-chung-minh-rang-b-eb-tim-c-ebc-eleftacap-bright.1898650356912
