1)= -1/8; 2)=1 1/9 3) = -1/2 4)= - 1/7 5)= 2/8=1/4;
6)= 5/6; 7)=4/12=1/3; 8)= - 4/15; 9)=4/16=1/4; 10)= -5/6+4/6= - 1/6;
11)= - 15/20+16/20=1/20; 12)= -4/8+1/8= - 3/8.
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1)= -1/8; 2)=1 1/9 3) = -1/2 4)= - 1/7 5)= 2/8=1/4;
6)= 5/6; 7)=4/12=1/3; 8)= - 4/15; 9)=4/16=1/4; 10)= -5/6+4/6= - 1/6;
11)= - 15/20+16/20=1/20; 12)= -4/8+1/8= - 3/8.