能简算的要简算.159×353535/353535105×103/104

能简算的要简算.159×353535/353535-105×103/104 -
159×353535/353535－105×103/104 =159-(104+1)(104-1)/104 =159-104+1/104 =55又1/104
159×353535/535353-105×103/104=(53x3x35x10101)/(53x10101)-105x103/104=35x3-105x103/104=105-105x103/104=(105x104-105x103)/104=105x(104-103)/104=105/104 1000+999-998-997+996+995-994-993+……104+103-102-101=1000+(999-998-997+996)+(995-994-993+992)+……(是什么。