几道计算题,1.(2/3-1/2)-(1/3-5/6)2.2.4-(-3/5)+(-3.1)+4/53,(-6/13)+(-7/13)-(-2)4.3/4-(-11/6)+(-7/3)
问题描述:
几道计算题,
1.(2/3-1/2)-(1/3-5/6)
2.2.4-(-3/5)+(-3.1)+4/5
3,(-6/13)+(-7/13)-(-2)
4.3/4-(-11/6)+(-7/3)
答
1. (2*2/3*2-1*3/2*3)-(1*2/3*2-5/6)
=(4-3)/6-(2-5)/6
=1/6-(-3)/6
=2/3
答
1.原式=2/3-1/2-1/3+5/6=4/6-3/6-2/6+5/6=4/6=2/3
2.原式=2.4+0.6-3.1+0.8=0.7
3.原式=-6/13-7/13+2=-1+2=1
4.原式=9/12+22/12-28/12=3/12=1/4