1/3+(-1/5)-1+3/2 0.5+（-1/4）-（-2.75）+1/2 （2/3）+(-1/6) -(1/4)-1/2
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1/3+(-1/5)-1+3/2
=1/3-1/5-1+3/2
=(1/3+3/2)-(1/5+1)
=11/6-6/5
=55/30-36/30
=19/30
0.5+(-1/4)-(-2.75)+1/2
=0.5-1/4+2.75+1/2
=0.5-0.25+2.75+0.5
=3.5
(2/3)+(-1/6)-(1/4)-1/2
=2/3-1/6-1/4-1/2
=(2/3-1/6-1/2)-1/4
=0-1/4
=-1/4
=1/3-1/5-1+3/2
=(1/3+3/2)-(1/5+1)
=11/6-6/5
=55/30-36/30
=19/30
0.5+(-1/4)-(-2.75)+1/2
=0.5-1/4+2.75+1/2
=0.5-0.25+2.75+0.5
=3.5
(2/3)+(-1/6)-(1/4)-1/2
=2/3-1/6-1/4-1/2
=(2/3-1/6-1/2)-1/4
=0-1/4
=-1/4
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