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2004.05*1997.05-2001.05*1999.05怎麼簡算？

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  • 1 # 陽光魯寧

    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

  • 2 # 使用者5676629402401

    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

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