1-4分之3-（0.75+3分之1）
=1-0.75-0.75+1/3
=1-(0.75+0.75)+1/3
=1-1.5+1/3
=-1/2+1/3
=-(1/2-1/3)
=-1/6
即-6分之1
原式=1-3/4-3/4-1/3
=1-1/3-3/2
=2/3-3/2
=4/6-9/6
=-5/6
1-4分之3-（0.75+3分之1）
=1-3/4-3/4-1/3
=1-3/2-1/3
=6/6-9/6-2/6
=-5/6
1-3/4-3/4-1/3=1-6/4-1/3=-1/2-1/3=-5/6
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