原 = (1/18-1000)*9 = 1/2-9000 = -8999.5
原 = (4^2/(7/3)^2)-(11/2)*(1/6)-(1/4) = (12/7)^2-11/12-1/4 = 144/49-7/6 = 521/294
-999又18分之17×9=多扫!简便算法!
原 = (1/18-1000)*9 = 1/2-9000 = -8999.5
原 = (4^2/(7/3)^2)-(11/2)*(1/6)-(1/4) = (12/7)^2-11/12-1/4 = 144/49-7/6 = 521/294