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1.(-2 3/4)+(+12 5/7)+(-4.125)+(+0.75)+(+1/8);

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1.(-2 3/4)+(+12 5/7)+(-4.125)+(+0.75)+(+1/8);
2.(-8 3/7)+(-7.5)+(-21 4/7)+(+3 1/2)
3.(-2 1/2)+(+5/6)+(-0.5)+(+1 1/6);
4.(-1)+2+(-3)+4+(-5)+6+...+(-99)+100;
1.(-2 3/4)+(+12 5/7)+(-4.125)+(+0.75)+(+1/8);
1.(-2 3/4)+(+12 5/7)+(-4.125)+(+0.75)+(+1/8)
= -2.75+0.75+12又5/7-4.125+0.125
= -2-4+12又5/7
=6又5/7
2.(-8 3/7)+(-7.5)+(-21 4/7)+(+3 1/2)
== -8又3/7-21又4/7-7.5+3.5
= -30-3.5
= -33.5
3.(-2 1/2)+(+5/6)+(-0.5)+(+1 1/6);
= -2.5-0.5+5/6+1又1/6
= -3+2
= -1
4.(-1)+2+(-3)+4+(-5)+6+...+(-99)+100;
= (-1+2)+(-3+4)……+(-99+100)
= 1×50
=50