1/2+3/4-3/10= 2/34/7+5/6= 10/(2/3+1/2)= 1/6-(5/12-1/4)=

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1/2+3/4-3/10= 2/34/7+5/6= 10/(2/3+1/2)= 1/6-(5/12-1/4)=
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1/2+3/4-3/10= 2/34/7+5/6= 10/(2/3+1/2)= 1/6-(5/12-1/4)=
1/2+3/4-3/10= 2/34/7+5/6= 10/(2/3+1/2)= 1/6-(5/12-1/4)=

1/2+3/4-3/10= 2/34/7+5/6= 10/(2/3+1/2)= 1/6-(5/12-1/4)=
1/2+3/4-3/10
=5/4-3/10
=19/20
2/3-4/7+5/6
=2/3+5/6-4/7
=3/2-4/7
=13/14
10/(2/3+1/2)
=10÷7/6
=60/7
=8又4/7
1/6-(5/12-1/4)
=1/6-1/6
=0