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Ta có: \(\frac{7}{9}+\frac{16}{48}=\frac{10}{9}=1\frac{1}{9}\)
\(\frac{43}{8}-0,125=\frac{43}{8}-\frac{1}{8}=\frac{21}{4}=5\frac{1}{4}\)
Vì: \(1\frac{1}{9}< 2< 3< 4< 5< 5\frac{1}{4}\)
=> x= { 2;3;4;5}
Bài 1:
1: =-5/24+16/27+3/4
=-5/24+18/24+16/27
=13/24+16/27
=117/216+128/216=245/216
2: =-1/3+1/3+6/7=6/7
3: \(=\dfrac{1}{2}-\dfrac{7}{12}+\dfrac{1}{2}=1-\dfrac{7}{12}=\dfrac{5}{12}\)
4: \(=-\dfrac{5}{8}+\dfrac{14}{25}-\dfrac{6}{10}=\dfrac{-125+112-120}{200}=\dfrac{-133}{200}\)
1) x\(\in\){-5;-4;-3;-2;-1;0;1;2;3}
2) x\(\in\){-10;-9;-8;-7;-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6;7;8;9}
3) x\(\in\) {-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6;7}
4) x\(\in\) {-11;-10;-9;-8;-7;-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6;7;8}
5) x\(\in\) {-9;-8;-7;-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6}
1, -6 < x < 4
=> x = { -5; -4; -3; -2; -1; 0; 1; 2; 3}
2, -11 < x < 10
=> x = { -10; -9; -8; -7; ....; 7 ; 8 ; 9}
3, -7 < x < 8
=> x = { -6; -5; -4; -3; -2; -1; 0; 1; 2; 3; 4; 5; 6; 7}
4, -12 < x < 9
=> x = { -11; -10; -9 ; ....; 5; 6; 7; 8}
5, -10 < x < 7
=> x = { -9; -8; -7; -6; .....; 5; 6}
1 a x=4
b x=-4
c x=-7
d x=3
e x=10
g x=60
h x=36
i x=16
2a 1,2,3,4,5,6,7,8,9
b 1,2,3,4,5,6,7,8,9.........
c rỗng
3a 0
b 0
c10
1.a)-4<x<3
=> x={-3;-2;-1;0;1;2}
b)-5<x<5
=>x={-4;-3;-2;-1;0;1;2;3;4}
2.a)1+(-3)+5+(-7)+9+(-11)
=(1+5+9)+[(-3)+(-7)+(-11)]
=15+(-21)
=-6
b)(-2)+4+(-6)+8+(-10)+12
=[(-2)+(-6)+(-10)]+(4+8+12)
=(-18)+24
=6
tick cho mk nha bạn
a)
\(-\dfrac{1}{3}< \dfrac{x}{36}\Rightarrow-36< 3x\Rightarrow x>-12\)
\(\dfrac{y}{18}< \dfrac{-1}{8}\Rightarrow8y< -18\Rightarrow y< -\dfrac{18}{8}< -2\) (do y là số nguyên )
\(\Rightarrow2y< -4\)
\(\dfrac{x}{36}< \dfrac{y}{18}\Rightarrow18x< 36y\Rightarrow x< 2y\)
\(\Rightarrow-12< x< -4\)
\(\Rightarrow x\in\left\{-11;-10;....;-3;-4\right\}\)
\(\Rightarrow y\in\left\{-11;-10;...;-3;-4\right\}\)
\(\dfrac{7}{9}+\dfrac{1}{3}< x< \dfrac{43}{8}+\dfrac{1}{10}\\ \dfrac{7}{9}+\dfrac{3}{9}< x< \dfrac{430}{80}+\dfrac{8}{80}\\ \dfrac{10}{9}< x< \dfrac{438}{80}\\ 1,1< x< 5,475\)
Mà x thuộc N
Do đó x thuộc {2;3;4;5}