第2个回答 2013-05-15
72*(7/8+7/12-5/6)
=72*(7/8)+72*(7/12)-72*(5/6)
=63+42-60
=45
(1/2)*(2/3)*(3/4)---------(98/99)
=1/99
98/[98右(98/99)]+1/100
=(100-2)/[(100-2)右(100-2)/(100-1)]+1/100
=(100-2)/{[(100-2)(100-1)+(100-2)]/(100-1)}+1/100
=(100-2)/{[(100-2)(100-1+1)]/(100-1)}+1/100
=(100-2)/{[(100-2)100]/(100-1)}+1/100
=(100-2)*{(100-1)/[(100-2)100]}+1/100
=(100-1)/100+1/100
=(100-1+1)/100
=1