题目

(1) (2) (﹣5)÷5× (3) (4) (﹣1)2020+ +(﹣3)﹣42 答案:解: 11−13+|−18| =11-13+18 =16 解:(﹣5)÷5× 15=(-5)× 15 × 15 =- 15 解: (79−56+34)×(−36) = 79 ×(-36)- 56 ×(-36)+ 34 ×(-36) =-28+30-27 =-25 解:(﹣1)2020+ −83 +(﹣3)﹣42 =1-2-3-16 =-20
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