简便运算1990/1990*1991+1990/1991*1992+.+1990/2001*2002=
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简便运算1990/1990*1991+1990/1991*1992+.+1990/2001*2002=
![简便运算1990/1990*1991+1990/1991*1992+.+1990/2001*2002=](/uploads/image/z/7776397-37-7.jpg?t=%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%971990%2F1990%2A1991%2B1990%2F1991%2A1992%2B.%2B1990%2F2001%2A2002%3D)
(1/1990*1991+1/1991*1992+.+1/2001*2002)×1990 =(1/1990-1/1991+1/1991-1/1992+.+1/2001-1/2002)×1990 =1-1990/2002=1-995/1001=6/1001
简便运算1990/1990*1991+1990/1991*1992+.+1990/2001*2002=
1990×1989.9-1989×198.8简便运算
简便运算1-2+3-4+5-6...+1989-1990+1991
有理数的简便运算1991X19901990-1990X19911991135X271+136/136X271-135
简便运算1+2-3-4+5+6-...-1987-1988+1989+1990=
2001/2002*2003简便运算
分数简便运算1985+1987+1989+.1999/1986+1988+1990+.2000
简便运算 1999²-1990² 9999²+19999 999×274+6274
数学简便运算:2000/2001×2002
简便运算2002^2-2001*1999
2002*2004-2001*2003简便运算
2000/(2001/2002)简便运算