1/4 x 12/13 + 1/6 x 12/13 + 1/8 x 12/13=?
tính nhanh
a) 12/13 + 2/7 + 8/13 + 6/13 + 5/7 =
b) (1 - 1/2) x (1 - 1/3) x ( 1 - 1/4) x (1 - 1/5) =
Tính bằng cách thuận tiện nhất
1. 14/9 : 13/12+4/3:13/12=?
2. 25/4x5/6-5/6x2/8 =?
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=?
3. Tính bằng cách hợp lý: A) 4/9 + 2/5 + 5/9. B) 6/13 + 5/8 + 7/13. C) 5/11 + 6/25 + 66/121. D) 1/2 + 1/3 + 1/4 + 1/6 + 1/12 + 1/24.
Bài 1:Tính
a) 11/4 - 9/8 + 15/12 b) 6/7 x 21/12 + 5/3
c) 13/18 : 5/9 -1 d) 3 + 9/4 : 3/5
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
a) 8/7 - 12/13 b) 5/6 x 3/4 - 1/4 c) 1/6 : 3/4 + 1/10
⛇3/8+3/4 3/4 nhân12
1/6-1/12 13/7-9/5
3/8:2