-1(1/2)-5(1/4)=-6(3/4) 3/2×-6(3/4) =-4.5也就是-4(1/2)
哥哥我真倒了!!!!
1、=-3/2-21/4 =-6/4-21/4 =-27/42、=3/2-27/4 =6/4-27/4 =-21/4
几年级啦 HI吧