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13,1, 1/2-(+1/3)=3/6-2/6= 1/6
2, (-8.5)-(-4.2)= -8.5+4.2=-4.3
3, (-1/10)-11(1/5)= -1/10 - 56/5 = -1/10 - 112/10 = -113/10
4, (-2/3)-(-2/3)-(+3/4)= -4/3-(3/4)= -16/12 - 9/12 = -25/12
2, (-8.5)-(-4.2)= -8.5+4.2=-4.3
3, (-1/10)-11(1/5)= -1/10 - 56/5 = -1/10 - 112/10 = -113/10
4, (-2/3)-(-2/3)-(+3/4)= -4/3-(3/4)= -16/12 - 9/12 = -25/12
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