五年级10道计算题

(1)。。7/10 + 1/10 = 8/10 = 4/5(2)。。5/9 + 4/9 = 9/9 = 1(3)。。8/15 + 3/15 = 11/15(4)。。9/14 + 3/14 = 12/14 = 6/7(5)。。3/5 + 8/5 = 11/5 (6)。。4/15 - 3/15 = 1/15(7)。。7/8 - 5/8 = 2/8 = 1/4(8)。。5/3 - 2/3 = 3/3 =1(9)。。7/8 - 4/8 = 3/8(10)。。1314/2010- 520/2010 = 794/2010 = 397/1005