Môn Toán Lớp 5: tính: 9/10 : 4/7 – 3/10 : 4/7

2 bình luận về “Môn Toán Lớp 5: tính: 9/10 : 4/7 – 3/10 : 4/7”

1. 9/10 : 4/7 – 3/10 : 4/7
   = 9/10 × 7/4 – 3/10 × 7/4
   = 7/4 × (9/10 – 3/10)
   = 7/4 × 6/10
   = 42/40
   = 21/20

    

   Trả lời
2. $\dfrac{9}{10}$$ : $$\dfrac{4}{7}$$-$$\dfrac{3}{10}$$:$$\dfrac{4}{7}$

    =9/10.7/4-3/10.7/4

   =7/4.(9/10-3/10)

   =7/4.6/10

   =21/20

   Trả lời