-1/4+5/6+2/3-1/2=5/6+2/3-1/2-1/4=3/2-1/2-1/4=1-1/4=3/4谢谢!
解:原式=-1/4+5/6+2/3-1/2=(-1/4-1/2)+(5/6+2/3)=-3/4+3/2=3/4
负4分之1加6分之5加3分之2减2分之1=(5/6+2/3)-(1/4+1/2)=9/6-3/4=3/2-3/4=6/4-3/4=3/4祝你开心
原式=(5/6+2/3)-(1/4+1/2)=3/2-3/4=3/4