简算:1949*(1/51-1/2000)+51*(1/1949-1/2000)-2000*(1/1949+1/51)+3请说明理由

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简算:1949*(1/51-1/2000)+51*(1/1949-1/2000)-2000*(1/1949+1/51)+3请说明理由简算:1949*(1/51-1/2000)+51*(1/1949-1

简算:1949*(1/51-1/2000)+51*(1/1949-1/2000)-2000*(1/1949+1/51)+3请说明理由
简算:1949*(1/51-1/2000)+51*(1/1949-1/2000)-2000*(1/1949+1/51)+3
请说明理由

简算:1949*(1/51-1/2000)+51*(1/1949-1/2000)-2000*(1/1949+1/51)+3请说明理由
=(2000-51)(1/51-1/2000)+(2000-1949)(1/1949-1/2000)-(1949+51)(1/1949+1/51)+3
=2000/51+51/2000-2+2000/1949+1949/2000-2-1949/51-51/1949-2+3
=(2000/51-1949/51)(51/2000+1949/2000)+(2000/1949-51/1949)-6+3
=1+1+1-6+3
=0

1949*1/51-1949*1/2000+51*1/1949-51*1/2000-2000*1/1949-2000*1/51+3=1/15*(1949-2000)+1/1949(51-2000)-1/2000(1949+51)+3=-1-1-1+3=0

简算:1949*(1/51-1/2000)+51*(1/1949-1/2000)-2000*(1/1949+1/51)+3请说明理由 1949*(1/51-1/2000)+51*(1/1949-1/2000)-2000*(1/1949+1/51) 1949*(1/51-1/2000)+51*(1/1949-1/2000)=2000*(1/51-1/1949) 1949x(1/51-1/2000)+51x(1/1949-1/2000)-2000X(1/1949+1/51)+3 1949x(1/51—1/2000)+51X(1/1949—1/2000)—2000X(1/1949+1/51)+3的计算过程. 1949×(1/51-1/2000)+51×(1949-1/2000)-2000×(1/1949+1/51)+3 1949*(1/50-1/2000)+51*(1/1949-1/2000)-2000*(1/1949+1/51)+3如何简算?急! 1949*(1/51-1/2000)+51*(1/1949-1/2000)+3要详细一点,不要直接等于1-1-1+3,看不懂.3Q 小学六年级分数简便计算习题1949×(1/51-1/2000)+51×(1/1949-1/2000)-2000×(1/1949+1/51)+3算式里的“/”是分数线,比如“1/2000”表示两千分之一.请按照简便计算法做这道题,不是特别麻烦的 /是分数线1/51=五十一分之一^2=2次方 ×是乘 第一题 2009+1949×(1/51-1/2000)+51×(1/1949-1/2000)-2000×(1/51+1/1949) 二:(1/3+1/4+1/5+1/6+1/7)^2+(1/3+1/4+1/5+1/6+1/7)×2/3-(1+1/2+1/3+1/4+1/5+1/6+1/7)×(1/4+1/5+1/6+1/7)三 (531/135+579 3+1949*(1/43-1/1992)+43*(1/1949-1/1992)-1992*(1/1949+1/43)简算 9.8×65.2×1.25-12.5×0.652×18计算各位会的帮帮忙吧1、9.8×65.2×1.25-12.5×0.652×18 2、1949×(1/51-1/2000)+51×(1/1949-1/2000)-2000×(1/1949+1/51)+3 3、1-1/2×{1-1/3×【1-1/4×(1-1/5)】} 4、1/ 59又1/2×2/3+79又1/3×3/4+99又1/4×4/5+119又1/5×5/6=?求简算.85又1/3×3/8+71又1/6×6/7+56又1/4×4/54×5又3/4+5×6又4/5+6×7又5/6+7×8又6/7+8×9又7/81949×(1/51-1/2000)+51×(1/1949-1/2000)-2000×(1/1949+1/51)+3=1949/51-1949/2000+5 简算:9又2001分之2000乘1949 51/6*1/13+5/6+12/13简算 (2000-2000+1)/(2000的平方-2000*1999+1999的平方)简算 1999除以1999又1999/2000加1/2001 简算 1998÷1998又1998/1999+1/2000简算