计算下面各题,能简算的要简算。 (1)4

计算下面各题,能简算的要简算。 (1)4 - - (2) ÷7+ × (3) ÷7× ÷ (4) ÷[( + )÷ ]

(1)原式=4 -( +
                =4 -1
                =3

(2)原式= × + ×
                =( + )×
                = ×
                =
(3)原式= × × ×
                =

(4)原式= ÷( ×
                = ÷
                =

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