Tìm x biết a) 3/4-2/5x=29/60 b) 6-1/2-x=2/5

2 bình luận về “Tìm x biết a) 3/4-2/5x=29/60 b) 6-1/2-x=2/5”

1. a.
   $\frac{3}{4}-\frac{2}{5}x=\frac{29}{60}$

   $→-\frac{2}{5}x=\frac{29}{60}-\frac{3}{4}$

   $→-\frac{2}{5}x=-\frac{4}{15}$
   $→x=\frac{2}{3}$

   b.

   $6-\frac{1}{2}-x=\frac{2}{5}$

   $→-x=\frac{2}{5}-6+\frac{1}{2}$

   $→-x=-\frac{51}{10}$

   $→x=\frac{51}{10}$

   Trả lời
2. a)3/4-2/5x=29/60

   2/5x=3/4-29/60

   2/5x=45/60-29/60

   2/5x=3/5

   x=3/5: 2/5

   x=3/5. 5/2

   x=3/2

   Vậy  x=3/2

   b)6-1/2-x=2/5

   12/2-1/2-x=2/5

   11/2-x=2/5

   x=11/2-2/5

   x=55/10-4/10

   x=51/10

   Vậy  x=51/10

   Trả lời