数学的简算（不是简算的别答）

来源：百度知道 编辑：UC知道 时间：2024/05/23 16:35:49
2005*2003/2004
24*51/43+51*19/43
5*1/5÷5*4/5
(8/9+2/3-2/27)*27
("/'是分数线)

1.2005*2003/2004
=(2004+1)(2004-1)/2004
=2004*2004-1/2004
=2004-1/2004
=2003+2003/2004
2.24*51/43+51*19/43
=51/43(24+19)
=51
3.5*1/5÷5*4/5
=1÷5*4/5
=4/25
4.(8/9+2/3-2/27)*27
=8/9*27+2/3*27-2/27*27
=24+18-2
=40

汗。。。

2005*2003/2004
=（2004+1)*(2004-1)/2004
=(2004^2-1)/2004
=2004-1/2004
=2003又2003/2004

24*51/43+51*19/43
=(24+19)*51/43
=43*51/43
=51

5*1/5÷5*4/5
=5*4/5*1/5÷5
=4*1/5÷5
=4/25

(8/9+2/3-2/27)*27
=8*27/9+2*27/3-2*27/27
=24+18-2
=40

2005*2003/2004 ＝(2004+1)(2004-1)/2004
=(2004^2-1)/2004
=2004-1/2004
=2003又2003/2004

24*51/43+51*19/43
=24*(51/43)+19*(51/43)
=(24+19)*(51/43)
=43*51/43
=51

5*1/5÷5*4/5
=1/5*4/5
=4/25

(8/9+2/3-2/27)*27
=(24/27+18/27-2/270*27
=40/27*27
=40