1）33-59.8-12.8-31.6-8.72）2.75-[-1/2+5/6-(3/8-14/3)3)1000+99.9-9.98-99.7+9.96+9.95-9.94-993(甚么东东?）4）（-3/4)×[(-2/5)-5/6]5)[3/7+1/2×(-2/3)]×(-21/5)6)[1/3-(-11/4)]×[(-2)÷4]

Question

1）33-59.8-12.8-31.6-8.7
2）2.75-[-1/2+5/6-(3/8-14/3)
3)1000+99.9-9.98-99.7+9.96+9.95-9.94-993(甚么东东?）
4）（-3/4)×[(-2/5)-5/6]
5)[3/7+1/2×(-2/3)]×(-21/5)
6)[1/3-(-11/4)]×[(-2)÷4]

Answer 1

1）33-59.8-12.8-31.6-8.7=33-（60+13+32+9-0.2-0.2-0.4-0.3）=33-112.9=-79.92）2.75-[-1/2+5/6-(3/8-14/3)=2.75-【1/3-（-103/24）】=2.75-37/8=-15/83)1000+99.9-9.98-99.7+9.96+9.95-9.94-993=1000+（99.9-9.98-...