`3/5 + 7/5 = (3+7)/5=10/5=2`
`1/8-1/2=1/8-4/8=(1-4)/8=-3/8`
`1/3+5/7=7/21+15/21=(15+7)/21=22/21`
`#LeMichael`
3/5 + 7/5 = 10/5 = 2
1/8-1/2 = -3/8
1/3+5/7 = 22/21
Tính 6/7+7/8 c 4/5-2/3 g 1/5:2/7 d 4/7-11/42 b 2/3+3/51
1:Tính :
a,1/2+7/8+7/19+42/47 b,3/2+6/5+17/8+36/27 c,3/5+(2/8+2/5+6/8) d,5 3/7+(2 5/21-1 2/3)
Tính nhanh
a) 31/23 - (7/32 + 8/23)
b) 38/45 - (8/45 - 17/51 - 3/11)
c)(1/3 + 12/67 + 13/41) - ( 79/67 - 28/41)
d) 1/5 + -1/6 + 1/7 + -1/8 + 1/9 + 1/8 + -1/7 + 1/6 + -1/5
X/17 x (1/2 + 1/3)=31/51
9/5 : x - 11/7= 32/21
Bài 1 :Sắp xếp các phân số theo thứ tự từ bé đến lớn :
a) 5/6 ; 10/11 ; 15/16 ; 7/8
b) 15/14 ; 14/21 ; 5/6 ; 8/7 ; 51/42
Bài 2 : Tìm x , biết :
a) (15 x 19 - x - 0,15 ) : 0,25 = 15 : 0,25
b) 2 3/4 - x = 1/3 x 6/2
so sanh hai phan so
1919/2121.........191919/212121
5/8cong1/8........3/4
1/42...................1/6-1/7
18/51.......................3/10
7/8-1/8...................5/6-1/3
a)7/8 : (14/3 +7/2) + 4/28=
b)21-3/4 : (3/4- 1/3 )=
c) (6 - 14/5) ✖️ 25/8 + 18/5 :1/4=
3\(\dfrac{1}{3}\)+\(\dfrac{5}{6}\) 4\(\dfrac{5}{7}\)-2\(\dfrac{11}{21}\) 3\(\dfrac{1}{4}\)x\(\dfrac{2}{5}\) 4\(\dfrac{7}{8}\):\(\dfrac{1}{4}\)
a) x : 5/13 + 2/26 = 1
b) x × 3/5 = 7/8
c) x = 3/7 + 4/21 + 5/42
3:1/2=?
1/2:3=?
2.tính theo mẫu
a)9/10*5/6=9*5 10*6=3*3*5 5*2*3*2=3/4
b)6/25:21/20=
40/7*14/5=
17/13:51/26=
