Toán Lớp 7: Tìm t thuộc Z sao cho 5t+2/17 là số nguyên
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Toán Lớp 7: Tìm t thuộc Z sao cho 5t+2/17 là số nguyên
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$5t+2\vdots17$
$<=>5t+2\vdots17$
$<=>5t+2∈B(17)=${$0;17;34;51;68;85;102…$}
$<=>5t=${$-2;15;32;49;66;83;100;…$}
$<=>t=${$\frac{-2}{5};3;\frac{32}{5};\frac{49}{5};\frac{66}{5};\frac{83}{5};20;…$}
Mà $t∈Z$
$=>t=${$3;20;…$}