AnB={(X，Y)|( 1，0)，(-2，3)}，
It is known that the set A = {x | x is an acute triangle} and the set B = {x | x is an obtuse triangle}, so find a, cross b, a and b.
An intersection B= an empty set and a union b = {x | x is an oblique triangle},
Given a marriage a = {x | x square +px+ 15 = 0}, let b = {x | x square -5x+q = 0}, a and b = {3} intersect, and find the values of p, q and AUB.
∫a = {3}, ∴3∈A,3∈B,∴3 square +3P+ 15=0, 3 square -5×3+q=0, and the solution is P=-8, q=6.
∴ a = {x | xsquare-8x+15 = 0} = {3,5}, set b = {x | xsquare-5x+6 = 0} = {2,3}
∴AUB={2,3,5}，
Given the set a = {x | x is less than or equal to 1}, the set b = {x | x is greater than or equal to a} and AUB=R, find the range of a.
a & lt= 1
It is known that the combination A = {x | 4-x is greater than 2x+ 1}, and r is a real number set, so we can find CRA.
A = {x | 4-x is greater than 2x+ 1} = {x | x = 1},
Given a set A = {1, 4, x}, a set B = {1, the square of x}, AUB=A, find the values of x and sets a and b.
∵AUB=A,∴X squared =4, or x squared =X,
X=2，X=-2，X=0，X= 1。
Because the elements of the set must satisfy mutual anisotropy, it is found that x =-2 and x = 1 do not meet the meaning of the question.
∴X=2,X=0
Given the set A = {x |-2 is less than or equal to x and less than or equal to 4}, the set B = {x |-3 is less than x and less than 2}, and the set C = {x |-3 is less than or equal to x and less than 0}, find AUB, (A passes through b) and c, (A passes through c) and (B passes through c).
Aub = {x |-3 less than x less than or equal to 4},
(a and b cross) and c = {x |-3 is less than or equal to x is less than 2},
(A and C) Intersection (B and c) = {x |-3 is less than or equal to X is less than 2}
Given the set u = {x | x is greater than or equal to 2}, combined with a = {y | 3 is less than or equal to y remainder 4} and the set b = {z | 2 is less than or equal to z is less than 5}, find the intersection of CUA, CUB and b and a.
CUA cross b = {x | 2
、
CUB union b union a = u = {x | x is greater than or equal to 2}