`3/8 + 5/12= 9/24 + 10/24=19/24`
` 5/9 xx 6/5= 30/45=2/3`
`9/4 - 5/6= 54/24 - 20/24=34/24=17/12`
`7/6 : 14/3=7/6 xx 3/14= 21/84=1/4`
1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/10+10/11+11/12+12/13+13/14+14/15=?
{ < , >, = }
5/6......11/12 4/7.......3/4 5/8..........3/8
10/14.....5/7 10/9 .......10/11 8/15...........8/9
Mẫu : Ta có: 5 x 6 x 7 x 9 = 5 x 6 x 7 x 9 = 5/6
12 7 x 27 6 x 2 x 7 x 9 x 3
a) 3 x 4 x 7 =
12 x 8 x 9
b)4 x 5 x 6 =
12 x 10 x 8
c)5 x 6 x 7=
12 x 14 x 15
Ai nhanh nhất TiCk ChO !
a) 12/5 - 4/9 x 5/6 =
b) 5/6 x 9/20 : 2/3 =
c) 8/9 x 7/4 + 5/12 x 8/3 =
5/6 + 5/8 + 3/4
12/15 + 3 + 3/5
4/3 x 7/8 x 5
8/9 x 6/5 : 3
7/12 + 5/8 x 4/3 - 3/4
(8/5 - 7/6) : 13/15 + 1/4
1:tính bằng cách thuận tiện nhất:
a)54 x 113 + 45 x 113 + 113 b)3/7 + 4/9 + 8/14 + 10/18
2:tính giá trị biểu thức
a)9/5 - 1/2 + 1/3
b)12/9 x 1/12 + 1/6 x 12/9
c)3/4 x (5/6 + 2/3)
d)3/2 - 2/3 : 2
Tính nhanh
( 24 x 5 - 12 x 10) x ( 1+2+3+4+5+6+7+8+9)
30 x 25 x 7 x 8/ 75 x 8 x 12 x 14
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
y x 18/5 - y x 3/5 =...
4/6 + 7/13 + 17/9 + 19/13 - 8/9 + 14/6
1 Tính
2/5+ 8/5= 6/5+ 3/7= 11/2 + 7/4 5/6+ 9/4 3/7+ 4/7 1/4+ 6/7 15/8 + 1/2 11/3+ 1/12 9/4+ 3/4 8/9 + 2/3 1/14+ 2/7 10/7+ 2/3
2 Tìm x
a, x-1/4= 6/5 b, x- 2/7= 1/3+ 1/6 c, x- ( 2/5 + 3/5 ) = 1/2 d, x- 1/6=2/5
3 Một xưởng may bán được 1/5 m vải thì còn lại 4/3 m vải . Hỏi lúc đầu xưởng may có tất cả bao nhiêu m vải
