-20 < x < 21
=> x \(\in\) {-19; -18; -17; -16; -15; -14; -13; -12; -11; -10; -9; -8; -7; -6; -5; -4; -3; -2; -1; 0; 1; 2; ...; 20}
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Tìm x : - 20 < x < 21
\(\Rightarrow\)x \(\in\){ - 19 ; - 18 ; - 17 ; - 16 ; ...... ; 19 ; 20 }
Vậy x \(\in\) { - 19 ; - 18 ; - 17 ; - 16 ; ...... ; 19 ; 20 }
Với -20 < x < 21
thì x = {-19 ; -18 ; -17 ; -16 ; -15 ; ... ; 19 ; 20 ; 21}
Vậy x = {-19 ; -18 ; 17 ; 16 ; 15 ; ... ; 19 ; 20 ; 21}
-20 < x < 21
nên x ={-19;-18;-17;-16;-15;-14;-13;-13;-12;-11;-10;-9;-8;-7;-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6;7;8;9;10;11;12;13;14;15;16;17;18;19;20}
chúc bạn học tốt!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
x = -19,-18,-17,-16,-15,-14,-13,-12,-11,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20