3/4+1/4-3/4-1/4 =（3/4-3/4）+（1/4-1/4）=0+0=0(5/8+2/27)*8+11/27 =5+16/27+11/27=5+1=636*(7/9+5/6)÷58 =（36x7/9+36x5/6）÷58=（28+30）÷58=12/3*3/5-1/2÷9/4=2/5-2/9=8/45手机提问的朋友在客户端右上角评...