計算(2/3)^2015*1.5^2014*(-1)^2016所得的結果是

計算(2/3)^2015*1.5^2014*(-1)^2016所得的結果是


(2/3)^2015×1.5^2014×(-1)^2016
=(2/3)×(2/3)^2014×(3/2)^2014×1
=(2/3)×[(2/3)×(3/2)]^2014
=(2/3)×1^2014
=(2/3)×1
=2/3



初一數學解方程:(y+4)/5-(y-5)=(y+3)/3-(y-2)/2


(y + 4)/5 -(y - 5)=(y + 3)/3 -(y - 2)/2兩邊同時乘以30得:6(y + 4)- 30(y - 5)= 10(y + 3)- 15(y - 2)6y + 24 - 30y + 150 = 10y + 30 - 15y + 30-24y + 174 = -5y + 6019y = 114y = 6



2007÷(2007+2007/2008)+1/2009


=2007÷[2007×(1+1/2008)]+1/2009
=1÷(1+1/2008)+1/2009
=2008/2009+1/2009
=1



(1/2009-1)*(1/2008-1)*(1/2007-1)*……*(1/3-1)*(1/2-1)


一共2008項,乘積為正
(1/2009-1)*(1/2008-1)*(1/2007-1)*……*(1/3-1)*(1/2-1)
=(1-1/2)*(1-1/3)*…*(1-1/2008)*(1-1/2009)
=1/2*2/3*3/4*…*2007/2008*2008/2009
=1/2009