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1,6-(1,6+0,8*0,625)÷2=
1,6-(1,6+0,5)÷2=
1,6-2,1÷2=
1,6-1,05=0,55
2,5-(8\15÷4+0,15)-5\24=
5\2-(8\15÷4\1+3\20)-5\24=
5\2-(8\15*1\4+3\20)-5\24=
5\2-(2\15+3\20)-5\24=
5\2-(8\60+9\60)-5\24=
5\2-17\60-6\24=
300\120-34\120-25\120=
241\120=2 1\120