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计算下面各题 能用简便方法的要用简便方法计算. (1)449×38×611(2)5×34+3
问题详情
计算下面各题,能用简便方法的要用简便方法计算.
参考答案
(1)449×38×611,
=449×611×38,
=83×38,
=1;
(2)5×34+34÷17,
=5×34+34×7,
=(5+7)×34,
=12×34,
=9;
(3)35×(47-25),
=35×47-35×25,
=20-14,
=6;
(4)45÷(3-415-1115),
=45÷[3-(415+1115)],
=45÷[3-1],
=45÷2,
=25;
(5)(0.75-316)×(29+13),
=916×59,
=516;
(6)6÷67-67÷6,
=7-17,
=667.
考点:方法