Question

Tìm số nguyên x ,biết :

a) \(\dfrac{x}{5} = \dfrac{-3}{15}\)

b) -3x + 15 = 9

Answer 1

a, Ta có:
\(\dfrac{x}{5}=-\dfrac{3}{15}\Leftrightarrow\dfrac{x}{5}=\dfrac{-1}{5}\Leftrightarrow x=-1\)
Vậy x=-1.
b, -3x +15 =9
<=> -3x = -6
<=> 3x=6
<=> x=2
Vậy x=2

Answer 2

a , X x15 = -3 x 5. X x 15 = -15. X = -15 : 15. X= -1