a)4/8×16/4:2/7 b)64/49:8/7+3/4 c)3/4+4/5×5/6 d)5/2-1/3:1/6

2 bình luận về “a)4/8×16/4:2/7 b)64/49:8/7+3/4 c)3/4+4/5×5/6 d)5/2-1/3:1/6”

1. $a)\dfrac{4}{8}×\dfrac{16}{4}:\dfrac{2}{7}$

   $=\dfrac{1}{2}×4:\dfrac{2}{7}$

   $=2:\dfrac{2}{7}$

   $=\dfrac{2}{1}×\dfrac{7}{2}$

   $=7$

   $b)\dfrac{64}{49}:\dfrac{8}{4}+\dfrac{3}{4}$

   $=\dfrac{512}{196}+\dfrac{3}{4}$

   $=\dfrac{128}{49}+\dfrac{3}{4}$

   $=\dfrac{512+147}{196}$

   $=\dfrac{659}{196}$

   $c)\dfrac{3}{4}+\dfrac{4}{5}×\dfrac{5}{6}$

   $=\dfrac{3}{4}+\dfrac{2}{3}$

   $=\dfrac{9+8}{12}$

   $=\dfrac{17}{12}$

   $d)\dfrac{5}{2}-\dfrac{1}{3}:\dfrac{1}{6}$

   $=\dfrac{5}{2}-2$

   $=\dfrac{5-4}{2}$

   $=\dfrac{1}{2}$

   Trả lời
2. a,4/8×16/4:2/7

   =1/2×4:2/7

   =7
   $\\$

   b,64/49:8/7+3/4

   =8/7+3/4

   =53/28

   $\\$

   c,3/4+4/5×5/6

   =3/4+2/3

   =17/12

   $\\$

   5/2-1/3:1/6

   =5/2-2

   =1/2

   Trả lời