For example, if the integer n is a complete set, then this topic cannot have decimals and fractions.
If the natural number * * * is set as a complete set, then negative integers cannot appear.
In most cases where the complete set is not directly specified, the default real number *** R is generally used as the complete set.
Question 2: What does the Complete Works of Mathematics in Senior One mean? Generally speaking, if a * * * contains all the elements involved in the problem we are studying, then this * * * is called the complete works, usually denoted as U.
AUB=S
The second question 10-a should belong to P, right? * * * and * * * are inclusive relations, and elements and * * * are subordinate relations.
The answer should be 3 1.
Question 3: In mathematics, what is the letter * * * and what does it mean? The more detailed, the better! Thank you n: non-negative integer * * or natural number * * {0, 1, 2,3, ...}
N* or N+: positive integer * * {1, 2,3, ...}
Z: integer * * {...,-1,0,1,...}
P: prime number * * *
Q: Rational number * * *
Q+: Positive Rational Number * * *
Q-: negative rational number * * *
R: real number * * *
R+: positive real number * * *
R-: negative real number * * *
C: complex number * * *
? : empty * * * (* * nothing is called empty * * *)
U: all * * * (including all the elements discussed in a question * * *)
Question 4: What do you mean by complete works? Can all * * * really be called complete works? 10. The complete works include all TV plays. * * * in one place, so the two concepts are different.
Question 5: What does I=R mean in mathematics * * *? I represent a complete set, R is a real number set, I=R, and the complete set is a real number set.
For example, I = R, AUB = I.
A=, find B.
AUB=I=R
AUB=R
B=CuA, because AUB=I, so B=CuA.
A=, CuA=(- infinity, 1)U(2,+infinity)
B=CuA=(- infinity, 1)u(2,+infinity)
Question 6: Ask a math problem in Grade Two. Both your idea and the teacher's idea are right.
Such an idea
C is known to belong to all real numbers.
The equation c +(a-2)c+a+ 1 -2a= 0 has a solution.
So △≥0, so we get a ∈ [0 0,4/3].
Yes, you already know that C is on [0,4/3].
But when c belongs to all real numbers, A ∈ [0 0,4/3] has been proved.
And c ∈ [0 0,4/3] is just a special case where c belongs to all real numbers.
So we must prove the result of A ∈ [0 0,4/3].
Maybe you want to say that C is in [0,4/3].
You can find a smaller range of a.
The title requirement is to verify a, b, c ∈ [0 0,4/3]
There is no need to seek a smaller scope.
In fact, C ∈ [0 0,4/3] does not narrow the scope of A.
The proof is complicated, so I won't list it.
So both you and the teacher are right.
Just use c to find the range of a on [0,4/3].
The result is also a, b, c ∈ [0 0,4/3].