(4573456378x68796386378-596688)/2=7462/3+543=[47566527845892-(452387+5894522-1)]/2=56x75/4= 34--67+8*234/56= 7646*9/76--45= 1235--67/788*46=764+743/90*45+56--87= 77+756/98*44+9= 87/90*67--45/90=53--87...