①4/3-(1/2-1/3)=4/3-1/2+1/3=8/6-3/6+2/6=7/6。②6/5+1/3-1/5=6/5-1/5+1/3=1+1/3=3/3+1/3=4/3。③5/6-1/13+1/6-12/13=5/6+1/6-(1/13+12/13)=0。
4/3-（1/2-1/3）
=（4/3+1/3）-1/2
=10/6-3/6
=7/6
=1又6分之1
6/5+1/3-1/5
=（6/5-1/5）+1/3
=1+1/3
=1又3分之1
5/6-1/13+1/6-12/13
=（5/6+1/6）-（113+12/13)
=1-1
=0
①4/3-(1/2-1/3)
=(4/3+1/3)-1/2
=5/3-1/2
=10/6-3/6
=7/6
②6/5+1/3-1/5
=(6/5-1/5)+1/3
=1+1/3
=4/3
③5/6-1/13+1/6-12/13
=(5/6+1/6)-(1/13+12/13)
=1-1
=0
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