Dấu hiệu chia hết cho 7

45

69

98

102

$x\in \left\{23, 24, 25, 27, 28, 29\right\}$

$x\in \left\{21, 22, 23, 24, 25, 26, 29\right\}$

$x\in \left\{22, 23, 24, 25, 26, 27, 29\right\}$

$x\in \left\{21, 22, 23, 24, 25, 26, 27, 28, 29\right\}$

$x\in \left\{21\right\}$

$x\in \left\{21, 28\right\}$

$x\in \left\{28\right\}$

Đáp án khác

$x\in \left\{21, 22, 23,24, 25, 26\right\}$

$x\in \left\{22, 23, 24, 26, 27, 28\right\}$

$x\in \left\{21, 22, 23, 24, 25, 26, 27\right\}$

$x\in \left\{22, 23, 24, 25, 26, 27\right\}$

$a+b không ⋮7$

$a+b⋮7$

$a-b không ⋮7$

$ka không ⋮7$

$ka không ⋮7$

$a+b⋮7$

$a-b⋮7$

$ka⋮7$

105+77+144

70+122+7

21+91+38

14+273+84

$b⋮7$

$b không⋮7$

$ka không ⋮7$

$ka⋮7$

$x⋮7$

$x không ⋮7$

$x\in \left\{\varnothing \right\}$

$x\in R$