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