a) 1/2 +3/4 = b) 3/5-3/8= c) 3/10×4/9= d) 5/8:3/2=

2 bình luận về “a) 1/2 +3/4 = b) 3/5-3/8= c) 3/10×4/9= d) 5/8:3/2=”

1. a)1/2+3/4=2/4+3/4=5/4

   b)3/5-3/8=24/40-15/40=9/40

   c)3/10×4/9=12/90=2/15

   d)5/8:3/2=5/8×2/3=10/24=5/12

   Trả lời
2. Giải đáp:

   a) 1/2 + 3/4

   = (1xx2)/(2xx2) + 3/4

   = 2/4 + 3/4

   = (2+3)/4

   = 5/4

   b) 3/5 – 3/8

   = (3xx8)/(5xx8) – (3xx5)/(8xx5)

   = 24/40 – 15/40

   = (24-15)/40

   = 9/40

   c) 3/10 xx 4/9

   = (3xx4)/(10xx9) 

   = 12/90

   = (12:6)/(90:6) = 2/15

   d) 5/8 : 3/2

   = 5/8 xx 2/3

   = (5xx2)/(8xx3)

   = 10/24

   = (10:2)/(24:2) = 5/12

   Trả lời