các bn lm đến đâu cx dc miễn là lm hộ mk cái ạ, ai đang lm vào nhắn tin vs mk để mk bít nha

a; \(-\dfrac{8}{3}+\dfrac{7}{5}-\dfrac{71}{15}< x< -\dfrac{13}{7}+\dfrac{19}{14}-\dfrac{7}{2}\)

              -\(\dfrac{19}{15}\) - \(\dfrac{71}{15}\) < \(x\) < -\(\dfrac{1}{2}\) - \(\dfrac{7}{2}\)

              -6 < \(x\) < -4

             vì \(x\) \(\in\) Z nên \(x\) = -5

khó nhỉ .

em chịu

a) x = 23, 22, 21, 20,....

b) x = 14, 13, 12, 11, 10,...

x thuộc N hay x thuộc Z vậy bạn

a) \(M=\left\{20;21;22;23;24;25;26\right\}\)

b) \(N=\left\{1;2;3;4;5;6;7\right\}\)

c) \(P=\left\{47;48\right\}\)

_Chúc bạn học tốt_

\(a/M=\left\{20;21;23;24;25;26\right\}\)

\(b/N=\left\{1;2;3;4;5;6;7\right\}\)

\(c/P=\left\{47;48\right\}\)

a) x = (-6;-5;-4;-3;-2;-1;0;1;2;3;4;5)

b) x = (-3;-2;-1;0;1;2;3;4;5;6;7)

c) -7< x <7

Chúc bạn học tốt!

a.

\(-7\le x< 7\)

\(\Rightarrow x\in\left\{-7;-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6\right\}\)

\(\left(-7\right)+\left(-6\right)+\left(-5\right)+\left(-4\right)+\left(-3\right)+\left(-2\right)+\left(-1\right)+0+1+2+3+4+5+6\)

\(=\left(-7\right)+\left[\left(-6\right)+6\right]+\left[\left(-5\right)+5\right]+\left[\left(-4\right)+4\right]+\left[\left(-3\right)+3\right]+\left[\left(-2\right)+2\right]+\left[\left(-1\right)+1\right]+0\)

\(=-7\)

b.

\(-9< x\le6\)

\(\Rightarrow x\in\left\{-8;-7;-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6\right\}\)

\(\left(-8\right)+\left(-7\right)+\left(-6\right)+\left(-5\right)+\left(-4\right)+\left(-3\right)+\left(-2\right)+\left(-1\right)+0+1+2+3+4+5+6\)

\(=\left(-8\right)+\left(-7\right)+\left[\left(-6\right)+6\right]+\left[\left(-5\right)+5\right]+\left[\left(-4\right)+4\right]+\left[\left(-3\right)+3\right]+\left[\left(-2\right)+2\right]+\left[\left(-1\right)+1\right]+0\)

\(=-15\)

Chúc bạn học tốt

mk cảm ơn nhé !Phương An

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}

tớ đau biết cách làm

khó thế