1、(7/9-5/6+3/4-7/18)*36 2、[1又2/3-(1/3-1/6+5/12)*2.4]*53、2又13/14*(-7) 4、(-5)*(-3又6/7)+(-7)*(-36/7)-(-12)*(-3又6/7)5、(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/2012)

问题描述:

1、(7/9-5/6+3/4-7/18)*36 2、[1又2/3-(1/3-1/6+5/12)*2.4]*5
3、2又13/14*(-7) 4、(-5)*(-3又6/7)+(-7)*(-36/7)-(-12)*(-3又6/7)
5、(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/2012)

1.原式=(28/36-30/36+27/36-13/36)*36
=(12/36)*36
=12
2.原式=[5/3-(4/12-2/12+5/12)*2.4]*5
=[5/3-(7/12)*(24/10)]*5
=(5/3-14/10)*5
=(50/30-42/30)*5
=(8/30)*5
=8/6=4/3=1又1/4
3.原式=(41/14)*(-7)= - 41/2= -20又1/2
4原式=(-5)*(-27/7)+36-(-12)*(-27/7)
=5*(27/7)+36-12*(27/7)
=36+ (5-12)(27/7)=36+(-7)*(27/7)=36-27=9

(7/9-5/6+3/4-7/18)*36=(7/18-1/12)*36=14-3=112、[1又2/3-(1/3-1/6+5/12)*2.4]*5=[5/3-(1/6+12/5)*12/5]*5==[5/3-(2/5+1)]*5=25/3-7=4/32又13/14*(-7)=-41/14 * 7=824、(-5)*(-3又6/7)+(-7)*(-36/7)-...