Tính:
a) $-7/17$ $.$ $(-34)$ $=$ $(-7).(-34)/17$ $=$ $14$
Tìm x:
b) $1/3$ $+$ $1/2x$ $=$ $-5/6$
$1/2x$ $=$ $-5/6$ $-$ $1/3$
$1/2x$ $=$ $-5/6$ $-$ $2/6$
$1/2x$ $=$ $-7/6$
$x$ $=$ $-7/6$ $÷$ $1/2$
$x$ $=$ $-7/3$
Vậy $x=-7/3$.
c) $x+1/3=-7/26.13/6$
$x+1/3=-7/12$
$x=-7/12-1/3$
$x=-7/12-4/12$
$x=-11/12$
Vậy $x=-11/12.$
HỌC TỐT!