`x xx 4/7 = 8/21`
`x = 8/21 : 4/7`
`x = 2/147`
____________________
`x : 3/4 = 4/5`
`x = 4/5 xx 3/4`
`x= 3/5`
`x xx 4/7 = 8/21`
`x = 8/21 : 4/7`
`x = 2/147`
____________________
`x : 3/4 = 4/5`
`x = 4/5 xx 3/4`
`x= 3/5`
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
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
bài 1: tính: a) 4/5 + 2/7 b) 2 - 8/9 c) 5/8 x 3 d) 5 : 6/21 đ) 3/5 x 4/5 x 6/7( ghi cả phép tính nha)
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
a 7/15 + 4/5 b 2/3 - 3/8 c 4/7 x 21/16 : 5/8 13 x 42 x 11/ 33x 26 x 35 tinh bang cach nhanh nhat sos x2 giup minh voi
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 =
tính
b) 2 - 8/9 =
c) 5/8 x 3 =
d) 5 : 6/21=
đ) 3/5 x 4/5 x 6/7=
tìm x : 5/6-(x2/8)=1/4
(x-3/5)×3/4=21/20
49/45:x/9=7/5
x×1/5+x×1/5+x×3/5=8/9
8/9:x-5/9:x=1/36
5/4×(x×2)=11/4
1. 8/11 + 8/33 x 3/4
7/9 x 3/14 : 5/8
5/12 - 7/32 : 21/16