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

Toán Lớp 10: Cho A={x€z|-5≤x<10} B={x€R|(x+1) (x²+3x-4)=0} Tìm A\B, B\A

Tháng Chín 24, 2022 Toán học 1 Comment 0 views

Toán Lớp 10: Cho A={x€z|-5≤x<10} B={x€R|(x+1) (x²+3x-4)=0} Tìm A\B, B\A

Comments ( 1 )

  1. danvanthu
    danvanthu
    24 Tháng Chín, 2022 at 11:28 chiều
    Reply
    A={x€Z|-5≤x<10} =>A(-5;-4;-3;-2;-1;0;1;2;3;4;5;6;7;8;9)
    B={x€R|(x+1) (x²+3x-4)=0} => $\begin{cases}x+1=0\\\left \{ {{x=1} \atop {x=-4}} \right.\end{cases}$
    =>$\begin{cases}x=-1\\\left \{ {{x=1} \atop {x=-4}} \right.\end{cases}$ 
    =>B(-4;-1;1)
    A\B = (-5;-3;-2;0;2;3;4;5;6;7;8;9)
    B \ A = ∅

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

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