要50个

问题描述:

要50个

1.5/2 -( 3/2 + 4/5 ) 2.7/8 + ( 1/8 + 1/9 ) 3.5/6 + ( 1/2 + 2/3 ) 4.9/7 - ( 2/7 - 10/21 ) 5.3/7 + 49/9 + 4/7 6.8/9 + 15/36 + 3/27 7.5/2 - ( 3/2 + 4/5 ) 8.7/8 + ( 1/8 + 1/9 ) 9.9/7 - ( 2/7 ...