2004.05×1997.05－2001.05×1999.05,怎么算?要简便的!
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2004.05×1997.05－2001.05×1999.05,怎么算?要简便的!
2004.05×1997.05－2001.05×1999.05,怎么算?要简便的!
2004.05×1997.05－2001.05×1999.05,怎么算?要简便的!
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
=(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)＋3×1997.0...
全部展开
=(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
收起
(a+4)(a-3)-(a+1)(a-1)=a-11=1989.05，a=2000.o5
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
2004.05×1997.05－2001.05×1999.05
=2004.05*1999.05 - 2004.05*2 - 2001.05*1999.05
=(2004-2001)*1999.05 - 2004.05*2
=3*1999.05 - 2*2004.05
=3*1999 + 3*0.05 - 2*2000 -2*4.05
=3*2000 - 3 + 0.15 - 2*2000 -8.10
=2000 - 3 + 0.15 - 8.10
=2000 +0.15 - 11.10
=1989.05
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