7/4 : 8/3 = 7/4 x 3/8 = 21/32
7/6 : 21/4 = 7/6 x 4/21= 2/9
8/ 5 : 16/7 = 8/5 x 7/16 = 7/10
5/12 : 25/4 = 5/12 x 4/24 = 1/15
7/4 : 8/3 = 7/4 x 3/8 = 21/32
7/6 : 21/4 = 7/6 x 4/21= 2/9
8/ 5 : 16/7 = 8/5 x 7/16 = 7/10
5/12 : 25/4 = 5/12 x 4/24 = 1/15
Câu 1. Tính :
7/4 : 8/3 =
7/6 : 21/4 =
8/ 5 : 16/7 =…
5/12 : 25/4 =
Bài 1 : Tính nhanh :
a, 2/3 + 3/4 + 4/5 + 12/9 + 28/6 + 48/15.
b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16 ;
c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16 ;
d, ( 1 + 1/2 ) x ( 1 + 1/3) x ( 1 + 1/4 ) x...x ( 1 + 1/175)
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 =
1.rút gọn rồi tính
8/12+16/30=
10/25+24/36=
18/27+35/42=
2.tính nhanh
3/7+6/5+4/7=
6/4+7/3+4/4+3/3=
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
tinh
a 7/15 + (5/6 - 1/3) =
b 4/7 *21/16 : 5/8 =
c 15/8 - 4/9 * 6/8+ 1/6 =
d 5/12+(3/4 + 2/3 ) : 34/3 =
Tính a)16/13-(3/15-6/13)
b)21/8-(1/2+3/5)
c)3/2x9/5-3-2x2/7
d)32/45x18/16
e)(4/3-4/5)x25/2
f)2-1/3-1/2-1/6-3/12
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26=
1.Tính
a)15/16 - 7/16 b)7/4 - 3/4 c)9/5 - 3/5 d) 17/49 - 12/ 49
Lưu ý không tính: 15/16 - 7/16 =8/16 2.
Rút gọn rồi tính
a) 2/3 -3/9 b)7/5 - 15/25