Toán Lớp 6: tìm số nguyên x biết:
a) -5 + x = 46
b) -11 chia hết cho x + 3
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Toán Lớp 6: tìm số nguyên x biết:
a) -5 + x = 46
b) -11 chia hết cho x + 3
Comments ( 2 )
x = 46 – (-5)
x = 51
Vậy x = 51
b) -11 \vdots x + 3
=>(x + 3) \in Ư(-11)
=>Ư(-11) = {-1;-11;1;11}
\Leftrightarrow $\left[\begin{matrix} x + 3 = -1 => x = -4\\ x + 3 = -11 => x = -14 \end{matrix}\right.$
\Leftrightarrow $\left[\begin{matrix} x + 3 = 1 => x = -2\\ x + 3 = 11 => x = 8\end{matrix}\right.$
Vậy x \in {-4 ; -14 ; -2 ; 8}