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!
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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...

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=(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

2004.05×1997.05－2001.05×1999.05,怎么算?要简便的! 求2004.05×1997.05－2001.05×1999.05的简便方法 2004.05×1997.05－2001.05×1999.05 （求简便运算） 一道巧算题2004.05×1997.05－2001.05×1999.05 2004.05×1997.05-2001.05×1999.05等于? 2004.05*1997.05*1999.05的简便计算 计算2001.05*1999.05-2004.05*1997.05的值 1、20022003/20032002-20022002/20032003(注:/为乘)2、（2004年小学数学奥林匹克决赛）1.2345的2次方+0.7655的2次方+2.469/0.67553、2004.05/1997.05-2001.5/1999.05不能用计算器!要简便计算! 2001×2001－2000×2002 97×2000－96×2001 . 2000×20012001－2001×20002000 数学题解答器2001³－2×2001²－1999÷2001³＋2001²－2002 2001×2002－2003分之2001+2002×1999怎么算 1001÷（2003^2－2001^2) 2000的平方－1999乘2001 2009×20012001－2001×20092009计算方法 2000×20012001－2001×20022002简便计算 若整数X满足－2001