6789乘6789-6790乘6788简算急阿-67
编辑： admin 2017-25-02
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6789乘6789－6790乘6788
=6789*6789-(6789+1)(6789-1)
=6789*6789-6789*6789+1
=1
提示：
6789×6789－6790×6788
=6789×6789-(6789+1)×(6789-1)
=6789×6789-(6789×6789-1)
=1
类似问题
类似问题1：6789*6789-6790*6788过程
6789*6789-6790*6788
=6789*6789-(6789+1)*(6789-1)
=6789*6789-6789*6789+1
=1
类似问题2：简算 455乘38/5+111除以5/96+43.3乘76 1234乘67896789-6789乘1234123438/5代表5分之38[数学科目]
1.455乘38/5+111除以5/96+43.3乘76
=455*76/10+111*192/10+433*76/10
=888*76/10+111*192/10
=111*(608+192)/10=8880
2.1234乘67896789-6789乘12341234
=1234*6789*(10000+1)-6789*1234*(10000+1)
=0
类似问题3：6789.6789除6.789怎么简算?[数学科目]
=6789/6.789+ 0.6789/6.789
=1000+0.1=1000.1
类似问题4：巧算12345×6789－12346×6788
=12345×(6788+1)-(12345+1)×6788
=12345×6788+12345×1-12345×6788-1×6788
=12345-6788
=5557
类似问题5：巧算12345×6789-123456×6788[数学科目]
(123456-1)*(6788+1)-123456*6788
=123456-6789
=116667
有没有12345最后有个5?