78*78+78*13的最简便运算
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/04 16:33:46
78*78+78*13的最简便运算
![78*78+78*13的最简便运算](/uploads/image/z/18290634-42-4.jpg?t=78%2A78%2B78%2A13%E7%9A%84%E6%9C%80%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97)
这种题目还是凑100比较好.
78*78+78*13
=78*78+78*13+78*9-78*9
=78*(78+13+9)-78*10+78
=78*100-780+78
=7800-780+78
=7020+78
=7098
78*78+78*13
=78*78+78*13+78*9-78*9
=78*(78+13+9)-78*10+78
=78*100-780+78
=7800-780+78
=7020+78
=7098