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下列各题怎样简便就怎样算 (1)57×38+58×57(2)34+12-712(3)815×
问题详情
下列各题怎样简便就怎样算
参考答案
(1)57×38+58×57,
=57×(38+58),
=57×1,
=57;
(2)34+12-712,
=54-712,
=23;
(3)815×516+527÷109,
=16+16,
=13;
(4)18×8÷18×8,
=18÷18×8×8,
=64;
(5)15÷[(23+15)×113],
=15÷[1315×113],
=15÷115,
=3;
(6)2-613÷926-23,
=2-43-23,
=2-(43+23),
=0.
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