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(3)2又6分之5-(2-1又6分之1+1又2分之1) (4)2又7分之4-(-7分之3+5分...答:(1)0.7-(-7/5+3/10-1/4-0.5) =0.7-(-28/20+6/20-5/20-10/20) =14/20-(-37/20) =51/20 (2)(-728)-(372)+1123+(-417) =-728-372+1123-417 =-394 (3)2又6分之5-(2-1又6分之1+1又2分之1) =16/5-(12/6-7/6+9/6) =48/15-35/15 =13/15 (4)2又7分之...