(1)72÷8-8 (2)(27-15)÷3 (3)(71-35)÷6 (4)590-(420+90) (5)20-12÷3 (6)7×

(1)72÷8-8 (2)(27-15)÷3 (3)(71-35)÷6 (4)590-(420+90) (5)20-12÷3 (6)7×9+21

(1)原式=9-8
                =1
(2)原式=12÷3
                = 4
(3)原式=36÷6
                =6
(4)原式=590-510
                =80
(5)原式=20-4
                =16
(6)原式=63+21
                =84

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