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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 10: 1.Cho A= {x€ R/|x| ≤ 4}; B={x€ R/ -5
Tháng Hai 13, 2023 Toán học 2 Comments 0 views

Toán Lớp 10: 1.Cho A= {x€ R/|x| ≤ 4}; B={x€ R/ -5

Comments ( 2 )

  1. catlantuong
    catlantuong
    13 Tháng Hai, 2023 at 10:21 chiều
    Reply
    $1)$
    $A = [-4;4]$
    $B= (-4;9]$
    $A\cup B = [-4;9]$
    $R\backslash (A\cup B)= (-\infty;-4)\cup (9;+\infty)$
    $A\cap B = (-4;4]$
    $A\backslash B = {-4}$
    $B\backslash A = (4;9)$
    $2)$
    $A = [-2;2]$
    $B = (-1;4)$
    $A\cup B = [-2;4)$
    $R\backslash (A\cup B)= (-\infty;-2)\cup [4;+\infty)$
    $A\cap B = (-1;2]$
    $A\backslash B = [-2-1]$
    $B\backslash A = (2;4)$
    $3)$
    $n(A)= 25;\ n(B)= 29;\ n(A\cup B)= 41$
    $n(A\cap B)= n(A) + n(B)- n(A\cup B)= 25 + 29 – 41 = 13$
    $n(A\backslash B)= n(A)- n(A\cap B)= 25 – 13 = 12$
    $n(B\backslash A)= n(B)- n(A\cap B)= 29 – 13 = 16$

  2. dongoctuan
    dongoctuan
    13 Tháng Hai, 2023 at 10:21 chiều
    Reply

    3)

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222-9+11+12:2*14+14 = ? ( )

Thanh Hương

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