Toán Lớp 10: Cho A={x€z|-5≤x<10}
B={x€R|(x+1) (x²+3x-4)=0}
Tìm A U B
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Toán Lớp 10: Cho A={x€z|-5≤x<10}
B={x€R|(x+1) (x²+3x-4)=0}
Tìm A U B
Comments ( 2 )
$⇒A=${$-5;-4;-3;-2;-1;0;1;2;3;4;5;6;7;8;9$}
$*)B=${$x∈R|(x+1) (x²+3x-4)=0$}
$⇒B=${$x∈R|(x+1) (x-1)(x+4)=0$}
$⇒B=${$-4;-1;1$}
$**)⇒A∪ B=${$-4;-1;1$}