(1\2+1\4+5\6)×1225-25×74\75(1\2+1\4+5\6)×12

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(1\2+1\4+5\6)×1225-25×74\75(1\2+1\4+5\6)×12
(1\2+1\4+5\6)×1225-25×74\75
(1\2+1\4+5\6)×12

(1\2+1\4+5\6)×1225-25×74\75(1\2+1\4+5\6)×12
(1\2+1\4+5\6)×12
=1\2×12+1\4×12+5\6×12
=6+3+10
=19
25-25×74\75
=25(1-74\75)
=25×1/75
=1/3

答案是22979/12

第二个 6+3+10=19

第一个不会简便