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(1)180÷(20×5-55)(2)21×(230-182÷14)(3)1900÷[(438+284)÷38](4)45×[300÷(38-26)]

题目详情
(1)180÷(20×5-55) (2)21×(230-182÷14)
(3)1900÷[(438+284)÷38] (4)45×[300÷(38-26)]
▼优质解答
答案和解析
(1)原式=180÷(100-55)
                =180÷45
                = 4
(2)原式=21×(230-13)
                =21×217
                = 4557
(3)原式=1900÷(722÷38)
                =1900÷19
                =100
(4)原式= 45×(300÷12)
                = 45×25
                =1125