Tính bằng cách thuận tiện nhất
A. 3/5 * 6/7 + 3/5 : 7 + 6/5
B. 29/12 : 1/2 - 5/12 : 1/2 - 1/2
C. 2/15 * 4/7 + 4/7 * 2/3 + 4/7 : 5
D. 14/15 * 15/16 * 16/17 : 14/51
4/ 5 x 15/11 x 2/9
4/7 x 2/5 + 4/7 x 3/5
(5/7 + 7/8) x 2
2/14 + 3/7 - 3/14 x 2
Tính nhanh:
3/5 × 5/7 + 12/20 × 2/14 + 9/15 : 7Tính nhanh:
3/5 × 5/7 + 12/20 × 2/14 + 9/15 : 7
2.Rút gọn rồi tính:
A) 3/5 : 3/2.
B) 3/7 : 3/14.
C) 5/7 x 7/10.
D) 5/11 x 33/15.
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=?
Tính:
3/5 x 5/7 + 12/20 x 2/14 + 9/15 : 7
Tính:
3/5 x 5/7 + 12/20 x 2/14 + 9/15 : 7
(2+2/3-1/4) ×1/5
7/15×15/14
3/5 x 5/7 + 12/20 x 2/14 + 9/15 : 7 ( tính nhanh)