数学的第二题。
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2。2/3+1/4-5/12=8/12+3/12-5/12
=6/12
=1/2.
7/8-5/6+2/3=21/24-20/24+16/24
=17/24.
7/10-(1-3/5)=7/10-2/5
=7/10-4/10
=3/10.
5/12+(2/3-1/2)=5/12+(4/6-3/6)
=5/12+1/6
=5/12+2/12
=7/12.
4/5+3/10-1/2=8/10+3/10-5/10
=6/10
=3/5.
3/4-(1/4+1/6)=3/4-(3/12+2/12)
=3/4-5/12
=9/12-5/12
=4/12
=1/3.
=6/12
=1/2.
7/8-5/6+2/3=21/24-20/24+16/24
=17/24.
7/10-(1-3/5)=7/10-2/5
=7/10-4/10
=3/10.
5/12+(2/3-1/2)=5/12+(4/6-3/6)
=5/12+1/6
=5/12+2/12
=7/12.
4/5+3/10-1/2=8/10+3/10-5/10
=6/10
=3/5.
3/4-(1/4+1/6)=3/4-(3/12+2/12)
=3/4-5/12
=9/12-5/12
=4/12
=1/3.
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