= 45/63 + 28/ 63 - 24/63
= 73/63 - 24/63
= 49/63 = 7/9
\(\dfrac{5}{7}\)+\(\dfrac{4}{9}\)-\(\dfrac{8}{21}\)=\(\dfrac{7}{9}\)
8/9 + 3/18 ; 5/7 - 4/11 ; 7/9 x 3/4 ; 12/7 : 1/4
3/4 + 4/5 ; 5/7 - 3/5 ; 8/3 x 21/4 ; 7/2 : 9/4
Điền dấu thích hợp vào chỗ chấm:
5 /3 …… 5/ 9
8/ 7 …….. 8/ 9
9/ 5 ……… 9/ 7
7 /2 ………. 14/ 4
21/ 31 …….. 21/ 20
Bài 3 : Tính
a) 11/7 + 3/5 , 4 + 1/9 b) 21/5 - 5/8 , 2 - 11/15
c) 3/19 x 38/9 , 21/5 x 2 c) 7/3 : 4/9 , 12/7 : 3
2/3 + 3/4
9/4 + 3/5
5/24 + 1/4
3/15 - 5/35 18/27 - 2/6 37/12 - 3
11/9 x 3/22 7/13 x 13/7 4 x6/7
2/5 : 3/10 3/8 : 9/4 8/21 : 4/7
11/15 + 8/15= Tính phân số
6/7 - 5/21=
25/4 x 16/100
7 x 2/49 =
4/3 : 2/9
5/8 : 25 =
bài 1 tính
a) 7/9+6/7x4/5
b) 21/23+4/5:6/8
c) 5/8x4/9:2/3
d) 7/12+5/6-21/24
1. 8/11 + 8/33 x 3/4
7/9 x 3/14 : 5/8
5/12 - 7/32 : 21/16
bài 1
4/7+4
3+6/11
3-5/7
21/9-2
15/24+2
63/45-20/25
3/4-2/8
6/7-5/8
37/45-5/9
46/39-11/13
5/12+3/4+1/3
1/2+3/7+11/14
7/10-(1/5+1/4)
15/4-2/3-3/4
tính
b) 2 - 8/9 =
c) 5/8 x 3 =
d) 5 : 6/21=
đ) 3/5 x 4/5 x 6/7=
