8< .....< 10
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\(\dfrac{7}{10}< \dfrac{?}{12}< \dfrac{8}{10}\)
\(\dfrac{7\times6}{10\times6}< \dfrac{?\times5}{12\times5}< \dfrac{8\times6}{10\times6}\)
\(\dfrac{42}{60}< \dfrac{?\times5}{60}< \dfrac{48}{60}\)
\(42< ?\times5< 48\)
\(\dfrac{42}{5}< ?< \dfrac{48}{5}\)
a/ |x| < 6 => -6 < x < 6 => x = { -5 ; - 4 ; -3 ; -2 ; -1;.....5}
b/ => x = {-9; -8; -7 ;...;7}
c/ => x = { -4 ; -3;-2;-1;0;1;2;3}
a, \(-6< x< 4\)
\(x\in\left\{-5;-4;-3;-2;-1;0;1;2;3\right\}\)
Tổng x bằng:
\(\left(-5\right)+\left(-4\right)+\left(-3\right)+\left(-2\right)+\left(-1\right)+0+1+2+3\)\(=\left(-5\right)+\left(-4\right)+\left[\left(-3\right)+3\right]+\left[\left(-2\right)+2\right]\left[\left(-1\right)+1\right]+0\)\(=\left(-5\right)+\left(-4\right)+0+0+0+0\)
\(=-9\)
b, \(-11< x< 10\)
\(x\in\left\{-10;-9;-8;-7;-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6;7;8;9\right\}\)
Tổng x bằng:
\(\left(-10\right)+\left(-9\right)+\left(-8\right)+\left(-7\right)+\left(-6\right)+\left(-5\right)+\left(-4\right)+\left(-3\right)+\left(-2\right)+\left(-1\right)+0+1+2+3+4+5+6+7+8+9\)
\(=\left(-10\right)+\left[\left(-9\right)+9\right]+\left[\left(-8\right)+8\right]+\left[\left(-7\right)+7\right]+\left[\left(-6\right)+6\right]+\left[\left(-5\right)+5\right]+\left[\left(-4\right)+4\right]+\left[\left(-3\right)+3\right]+\left[\left(-2\right)+2\right]+\left[\left(-1\right)+1\right]+0\)
\(=\left(-10\right)+0+0+0+...+0+0+0\)
\(=-10\)
Những bài còn lại bạn làm tương tự.
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}
8<9<10 nhé
8< 9 < 10