简便运算,请大师解!!答出采纳!
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31/5+32/5+33/5+34/5+35/5
=1/5*(31+32+33+35)
=1/5*(31+35)*4/2
=1/5*33*4
=26.4
9999*9998-9998*9997-9997*9996+9996*9995
=9998*(9999-9997)-9996*(9997-9995)
=2*(9998-9996)
=2*2
=4
6000-1-3-5-……-97-99
=6000-(1+3+5+……+97+99)
=6000-(1+99)*50/2
=6000-2500
=3500
100-98+96-94+92-90+……+8-6+4-2
=(100-98)+(96-94)+(92-90)+……+(8-6)+(4-2)
=2*25
=50
=1/5*(31+32+33+35)
=1/5*(31+35)*4/2
=1/5*33*4
=26.4
9999*9998-9998*9997-9997*9996+9996*9995
=9998*(9999-9997)-9996*(9997-9995)
=2*(9998-9996)
=2*2
=4
6000-1-3-5-……-97-99
=6000-(1+3+5+……+97+99)
=6000-(1+99)*50/2
=6000-2500
=3500
100-98+96-94+92-90+……+8-6+4-2
=(100-98)+(96-94)+(92-90)+……+(8-6)+(4-2)
=2*25
=50
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