
分母是42的所有最简真分数的和是多少?
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1/42+5/42+11/42+13/42+17/42+19/42+23/42+25/42+29/42+31/42+37/42+41/42
=(41/42+1/42)+(5/42+37/42)+(11/42+31/42)+(13/42+29/42)+(17/42+25/42)+(19/42+23/42)
=1+1+1+1+1+1
=6
=(41/42+1/42)+(5/42+37/42)+(11/42+31/42)+(13/42+29/42)+(17/42+25/42)+(19/42+23/42)
=1+1+1+1+1+1
=6
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