计算:
(1)$(+5)-7-(-4)+(-5)+10$; (2)$(-\frac {1}{2})+(+\frac {4}{3})-\frac {7}{4}+(-3)$;
(3)$-20-(-18)+(-14)+13$; (4)$12-(-7)-(+6)+(-9)+(+11)$;
(5)$(+5)-(-3)+(-7)-(+12)$; (6)$(-8)-(-10)+(-6)-(+4)$;
(7)$(-0.5)-(-2\frac {1}{4})+2.75-(-5\frac {1}{2})$; (8)$(-3)+(-6)-(+4.8)-(-7)$.
(1)$(+5)-7-(-4)+(-5)+10$; (2)$(-\frac {1}{2})+(+\frac {4}{3})-\frac {7}{4}+(-3)$;
(3)$-20-(-18)+(-14)+13$; (4)$12-(-7)-(+6)+(-9)+(+11)$;
(5)$(+5)-(-3)+(-7)-(+12)$; (6)$(-8)-(-10)+(-6)-(+4)$;
(7)$(-0.5)-(-2\frac {1}{4})+2.75-(-5\frac {1}{2})$; (8)$(-3)+(-6)-(+4.8)-(-7)$.
答案:
$(1)7 (2)-3\frac{11}{12} (3)-3 (4)15 (5)-11 (6)-8 (7)10 (8)-6.8$
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