4分之1+(-4分之3)-2分之1
=1/4-3/4-1/2
=-2/4-1/2
=-1/2-1/2
=-1;
(-9分之4)+4分之1-2分之1
=-4/9+1/4-1/2
=-4/9-1/4
=-16/36-9/36
=-25/36;
(-11.5)-(-4.5)-3
=-11.5+4.5-3
=-14.5+4.5
=-10;
(-7分之1)+(-35分之2)-(-5分之2)
=-1/7-2/35+2/5
=-5/35-2/35+14/35
=7/35
=1/5;
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