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. |