23乘23加23乘78减77怎么巧算
第1个回答 2016-12-17
这样的
第2个回答 2016-12-17
23x23+23x78-77
=23x23+23x78-23-54
=23x(23+78-1)-54
=23x(23+77)-54
=23x100-54
=2300-54
=2246
谢谢,请采纳
=23x23+23x78-23-54
=23x(23+78-1)-54
=23x(23+77)-54
=23x100-54
=2300-54
=2246
谢谢,请采纳
第3个回答 2016-12-17
看
第4个回答 2016-12-17
23x23+23x78-77
=23x(22+1)+23x78-77
=23x22+23+23x78-77
=23x(22+78)+23-(100-23)
=23x100+23x2-100
=(23-1)x100+23x2
=2200+46
=2246本回答被网友采纳
=23x(22+1)+23x78-77
=23x22+23+23x78-77
=23x(22+78)+23-(100-23)
=23x100+23x2-100
=(23-1)x100+23x2
=2200+46
=2246本回答被网友采纳