(-2000 5/6)+(-1999 2/3)+4000 3/4 +(-1 1/2)
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(-20005/6)+(-19992/3)+40003/4+(-11/2)(-20005/6)+(-19992/3)+40003/4+(-11/2)(-20005/6)+(-19992/3)+4000
(-2000 5/6)+(-1999 2/3)+4000 3/4 +(-1 1/2)
(-2000 5/6)+(-1999 2/3)+4000 3/4 +(-1 1/2)
(-2000 5/6)+(-1999 2/3)+4000 3/4 +(-1 1/2)
原式=-2000-5/6-1999-2/3+4000+3/4-1-1/2
=(-2000-1999+4000-1)-5/6-2/3+3/4-1/2
=-10/12-8/12+9/12-6/12
=-5/4
(-2000 5/6)+(-1999 2/3)+4000 3/4 +(-1 1/2)
=(-2000-1999+4000-1)+(-5/6-2/3+3/4-1/2)
=0-1又1/4
=-1又1/4
(-2000 5/6)+(-1999 2/3)+4000 3/4 +(-1 1/2)
计算(1+3+5+.+1999+2000+2001)-(2+4+6+.+1998+2002)
(1+3+5+...+1999+2000+2001)-(2+4+6+...+1998+2002)
简便运算:(2+4+6+8+.+1998+2000)-(1+3+5+7+.+1997+1999)
速算:(2+4+6+...+1998+2000)-(1+3+5+...+1997+1999)
(2+4+6+……+2000)-(1+3+5+……+1999)
1-2+3-+5-6+.+1999-2000+2001
1-2+3-4+5-6+.+1999-2000+2001
(2+4+6+.+2000)-(1+3+5+.+1999) 简便计算
1-2+3-4+5-6+……+1999-2000
(2+4+6+.+2000)-(1+3+5+.+1999)=?
1+2+3+4+5+6+7.+1998+1999+2000
(2+5+8+...+2000)-(1+4+7+...+1999)
数学计算题,(1+3+5+ ``` +1999+2000+2001)-(2+4+6+```+1998+2002)99`````````9 Ⅹ 99`````````9+1999```````9(2000个9) (2000个9) (2000个9)
计算:(-2000 5/6)+(-1999 2/3)-(4000 3/4)-(+1 1/2)
(-2000又5/6)+(-1999又2/3)-(-4000又3/4)-(+1又1/2)
计算(-2000 6/5)+(-1999 3/2)+4000 4/3+(-1 2/1)快
巧算(1/(2/3)/(3/4)/(4/5)/(5/6)/./(1999/2000)/(2000/2001)/(2001/2002)