Đáp án:
$a)1/2+1/5=2/3x-1/4$
$⇔ -2/3x = -1/4-1/2-1/5$
$⇔ -2/3x = -0,95$
$⇔ x = 1,425$
$b)-1/5x-2/3=1/10x+5/6$
$⇔ -1/5x - 1/10x = 5/6+2/3$
$⇔ -0,3x = 1,5 $
$⇔ x = -5$
$c)x-5/4=1/3-3/4x$
$⇔ x+3/4x = 1/3+5/4$
$⇔ 1,75x = 19/12 $
$⇔ x=19/21$
$d)3/2x-3/2=x-3/4$
$⇔ 3/2x - x = 3/2-3/4$
$⇔ 0,5x=0,75$
$⇔ x=1,5$
$e)-4/5+2x=1/3-2/3x$
$⇔ 2x+2/3x = 1/3+4/5$
$⇔ 8/3 x = 17/15$
$⇔ x = 0,425$
$f)2(x-1/3)-3(x-1/2)=1/2x$
$⇔ 2x-2/3 - 3x+1,5 - 1/2x=0$
$⇔ -1,5x - 5/6 = 0 $
$⇔ -1,5x = 5/6$
$⇔ x = -5/9$
$g)-3(x-1/4)-1/3(x+1/2)=x$
$⇔ -3x+0,75 - 1/3x - 1/6-x=0$
$⇔ -13/3x +7/12=0$
$⇔ -13/3x = -7/12$
$⇔ x=7/52$
$h)3/2(x-5/3)-4/5=x+1$
$⇔ 3/2x - 2,5 - 4/5 - x - 1 =0$
$⇔ 0,5x -4,3 = 0 $
$⇔ 0,5x = 4,3$
$⇔ x=8,6$
$i)1/6(2x-3)=1/2(-x+1/4)-2/3$
$⇔ 1/3x - 0,5 = -1/2x + 1/8 - 2/3$
$⇔ 1/3x + 1/2x = 1/8 - 2/3 + 0,5 $
$⇔ 5/6 x = -1/24$
$⇔ x=-0,05$
$k)-2/3(x-1/4)=1/3(2x-1)$
$⇔ -2/3x + 1/6 = 2/3x - 1/3 $
$⇔ -2/3x - 2/3x = -1/3 - 1/6$
$⇔ -4/3x = -1/2 $
$⇔ x=0,375$
BẠN THAM KHẢO NHA!!!
