题目

脱式计算: (1) 19.87- -( +8.87) (2) ×4+ ×77 (3) 1.6×[1÷(2.1-2.09)] 答案: 19.87-913-(413+8.87) =19.87-913-413-8.87 =(19.87-8.87)-(913+413) =11-1 =10 2325 ×4+ 425 ×77 = 2325 ×4+ 7725 ×4 =4×(2325+7725) =4×4 =16 1.6×[1÷(2.1-2.09)] = 1.6×[1÷0.01] =1.6×100 =160
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