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找窍门 怎样算简便就怎样算.(1)56×65-910÷95(2)4-511-711(3)31
问题详情
找窍门,怎样算简便就怎样算.
(1)
(2)4-
(3)3
(4)[
(5)20
(6)
参考答案
(1)56×65-910÷95
=1-910×59,
=1-12,
=12;
(2)4-511-711
=4-(511+711),
=4-1,
=3;
(3)315×[(123+15)×217]
=165×[(53+15)×157],
=165×[53×157+15×157],
=165×[257+37],
=165×4,
=1245;
(4)[34-0÷(17+213)]×113
=[34-0]×43,
=34×43,
=1;
(5)201100×83+1.7×200110
=20.01×83+1.7×200.1
=200.1×8.3+1.7×200.1,
=(8.3+1.7)×200.1,
=10×200.1,
=2001;
(6)45÷[(58-12)÷58]
=45÷[(58-12)×85],
=45÷[58×85-12×85],
=45÷[1-45],
=45÷15,
=4.
考点:窍门