题目内容

脱式计算。
(1)1200÷1.6×0.84 (2)(4÷-÷4)×
(3)(+×)÷ (4)7.2÷[3.2×(1 - )]
(1)原式=750×0.84
                =630

(2)原式=(5 - )×
                =×
                =
(3)原式=(+)÷
                =÷
                =
(4)原式=7.2÷[3.2×]
                =7.2÷0.8
                =9
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