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计算下面各题 能简算的要使用简便方法计算.(1)2319×112-1719÷12(2)87÷
问题详情
计算下面各题,能简算的要使用简便方法计算. (1)2319×112-1719÷12
(1)23 19× 1 12- 17 19÷12
(2)87÷8 7- 7 8+14×0.875
(3)32 5- 5 6÷ 10 11- 13 12
(4)13 33÷( 20 33+ 10 11- 1 3)
(5)5 7×( 7 5+ 14 15)
(6)[3 4÷ 3 4+( 3 5÷9- 1 15)]× 3 5.
参考答案
=2319×112-1719×112,
=(2319-1719)×112,
=619×112,
=138;
(2)87÷87-78+14×0.875
=87×78-1×78+14×0.875,
=87×0.875-1×0.875+14×0.875,
=(87-1+14)×0.875,
=100×0.875,
=87.5;
(3)325-56÷1011-1312
=325-56×1110-1312,
=325-1112-1312,
=325-(1112+1312),
=325-2,
=125;
(4)1333÷(2033+1011-13)
=1333÷(2033+3033-1133),
=1333÷3933,
=1333×3339,
=13;
(5)57×(75+1415)
=57×75+57×1415,
=1+23,
=123;
(6)[34÷34+(35÷9-115)]×35
=[1+(35×19-115)]×35,
=[1+(115-115)]×35,
=[1+0]×35,
=35.考点:方法