630-42简便运算
2019-04-15 分类:百科
方法一:先填数,再相减
630-42
=642-12-42
=600-12
=590-2
=588
方法二拆分减数,逐步相减
630-42
=630-30-10-2
=600-10-2
=588
方法三把较大的数化和小减小
630-42
=530+100-42
=530+58
=588
方法四
630-42
=630+20-42-20
=600+50-42-20
=600-20+8
=588
阅读剩余内容
方法一:先填数,再相减
630-42
=642-12-42
=600-12
=590-2
=588
方法二拆分减数,逐步相减
630-42
=630-30-10-2
=600-10-2
=588
方法三把较大的数化和小减小
630-42
=530+100-42
=530+58
=588
方法四
630-42
=630+20-42-20
=600+50-42-20
=600-20+8
=588