Tính thuận tiện a)15,27-4,18-2,09 b)45,28+52,17-15,28-12,17 c)54,27+16,9-2,27 d)7/15+7/4+8/15+5/4

0 bình luận về “Tính thuận tiện a)15,27-4,18-2,09 b)45,28+52,17-15,28-12,17 c)54,27+16,9-2,27 d)7/15+7/4+8/15+5/4”

1. a, 15,27 – 4,18 – 2,09 

   = ( 15,27 – 4,18 ) – 2,09

   = 11,09 – 2,09

   = 9

   b, 45,28 + 52,17 – 15,28 – 12,17

   = ( 45,28 – 15,28 ) + ( 52,17 – 12,17 )

   = 30 + 30 

   = 60

   c, 54,27 + 16,9 – 2,27

   = ( 54,27 – 2,27 ) + 16,9

   = 52 + 16,9

   = 68,9

   d, $\frac{7}{15}$  + $\frac{7}{4}$  + $\frac{8}{15}$ + $\frac{5}{4}$ 

   = ( $\frac{7}{15}$ + $\frac{8}{15}$ ) + ( $\frac{7}{4}$ + $\frac{5}{4}$ )

   = 1 + 3

   = 4

   Trả lời

2. a)$15,27 – 4,18 – 2,09$

   $= 11,09 – 2,09$

   $=9$

   b) $45,28+52,17-15,28-12,17$

   $=45,28 – 15,28 + 52,17 – 12,17$

   $=30 + 40$

   $=70$

   c) $54,27 + 16,9 – 2,27$

   $=54,27 – 2,27 + 16,9$

   $= 52 + 16,9$

   $= 68,9$

   d) $\frac{7}{15}$ + $\frac{7}{4}$+ $\frac{8}{15}$+ $\frac{5}{4}$

   = $\frac{7}{15}$ + $\frac{8}{15}$ + $\frac{7}{4}$+ $\frac{5}{4}$

   =  $ 1 + 3$

   = $4$

   HỌC TỐT!!! 

   Trả lời