Question

2004.05*1997.05-2001.05*1999.05的简便运算

Answer 1

2004.05×1997.05－2001.05×1999.05
=(2001.05+3)×1997.05－2001.05×1999.05
=2001.05x1997.05+3x1997.05-2001.05x1999.05
=2001.05x(1997.05-1999.05)+3x(2000-2.95)
=2001.05x-2+3x2000-2.95x3
=-4002.1+6000-(3-0.05)x3
=6000-4000-2.1-9+0.15
=2000.15-11.1
=1989.05
望采纳~

Answer 2

=（2001.05+3）*（1999.05-2）-2001.05*1999.05
=2001.05*1999.05-2*2001.05+3*1999.05-6-2001.05*1999.05
=-2*2001.05+3*1999.05-6
=3（2000-0.95）-4002.1-6
=6000-3*0.95-4008.1
=6000-4000-8.1-3（1-0.05）
=2000-8.1-3+0.15
=2000-3-8.1+0.1+0.05
=2000-3-8+0.05
=1989+0.05
=1989.05

Answer 3

2004.05×1997.05-2001.05×（1997.05+2）

=2004.05×1997.05-2001.05×1997.05-2001.05×2

=3×1997.05-2001.05×2

=3×1997.05-2001.05×（3-1）

=3×1997.05-2001.05×3+2001.05

=3×（1997.05-2001.05）+2001.05

=-12+2001.05 = 1989.05

Answer 4

2004.05×1997.05－2001.05×1999.05
=(2001.05+3)×1997.05－2001.05×1999.05
=2001.05x1997.05+3x1997.05-2001.05x1999.05
=2001.05x(1997.05-1999.05)+3x(2000-2.95)
=2001.05x-2+3x2000-2.95x3
=-4002.1+6000-(3-0.05)x3
=6000-4000-2.1-9+0.15
=2000.15-11.1
=1989.05

Answer 5

=(2001.05＋3)×1997.05－2001.05×1999.05
=2001.05×1997.05＋3×1997.05－2001.05×1999.05
=[2001.05×1997.05－2001.05×1999.05]＋3×1997.05
=2001.05×(1997.05－1999.05)＋3×1997.05
=2001.05×(－2)＋3×1997.05
=2001.05×[1－3]＋3×1997.05
=2001.05－3×2001.05＋3×1997.05
=2001.05－3×4
=2001.05－12
=1989.05