计算下面各题.(能简便的要用简便方法计算) 800-600÷20 18×(537-488) 35×18 329-186-14

计算下面各题.(能简便的要用简便方法计算) 800-600÷20 18×(537-488) 35×18 329-186-14 25×37×4 720÷16÷5.

(1)800-600÷20,
=800-30,
=770;

(2)18×(537-488),
=18×49,
=882;

(3)35×18,
=35×2×9,
=70×9,
=630;

(4)329-186-14,
=329-(186+14),
=329-200,
=129;

(5)25×37×4,
=(25×4)×37,
=100×37,
=3700;

(6)720÷16÷5,
=720÷(16×5),
=720÷80,
=9.

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