tìm x biết
1 1
a) 2x _ = 3 ( x + _ ) – ( – 1)
3 5
tìm x biết 1 1 a) 2x _ = 3 ( x + _ ) – ( – 1) 3 5
By Ruby
By Ruby
tìm x biết
1 1
a) 2x _ = 3 ( x + _ ) – ( – 1)
3 5
Đáp án:
Hc tốt!!!!!
Giải thích các bước giải:
$2x.$$\frac{1}{3}$$=3$$(x+$$\frac{1}{5}$$) $$ -(-1)$
$⇔ $$\frac{2}{3}$$x$=$3x$$+$$\frac{8}{5}$
$⇔ 10x=45x+24$
$⇔ 10x-45x=24$
$⇔ -35x=24$
$⇒ $$x$=$\frac{24}{35}$
$2x.\dfrac{1}{3}=3.(x+\dfrac{1}{5})-(-1)$
$2x.\dfrac{1}{3}=3x+\dfrac{3}{5}+1$
$\dfrac{2x}{3}-3x-\dfrac{8}{5}=0$
$x.\dfrac{2}{3}-3x=\dfrac{8}{5}$
$x.(\dfrac{2}{3}-3)=\dfrac{8}{5}$
$x.(-\dfrac{7}{3})=\dfrac{8}{5}$
$x=\dfrac{8}{5}:(-\dfrac{7}{3})$
$x=\dfrac{8}{5}.(-\dfrac{3}{7})$
$→x=-\dfrac{24}{35}$