2099-5.5*7.5+1/4*55-4.5简便计算

2099-5.5*7.5+1/4*55-4.5简便计算

您好：

2099-5.5*7.5+1/4*55-4.5
=2009-4.5-5.5x7.5+0.25x55
=2004.5-5.5x7.5+2.5x5.5
=2004.5-5.5x(7.5-2.5)
=2004.5-4.5x5
=2004.5-22.5
=1982

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=2099-55*3/4+1/4*55-4.5=2099-55/2-9/2=2099-32=2067

2099-5.5*7.5+1/4*55-4.5
=2099-5.5*7.5+0.25*55-4.5
=2099-5.5*7.5+2.5*5.5-(10-5.5)
=2099-5.5*7.5+2.5*5.5+5.5-10
=2089-5.5*(7.5-2.5-1)
=2089-5.5*4
=2089-22
=2067

2099-5.5*7.5+1/4*55-4.5
=2099-55×3/4+1/4×55-4.5
=2099-55×（3/4-1/4)-9×1/2
=2099-1/2(55+9)
=2099-32
=2067
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