脱式计算。819+81÷9 1000-791+209 (451-379)...

2023-02-13

【题目】脱式计算。

819+81÷9        1000-791+209       (451-379)÷8        593-(271+169)

【答案】828    418     9      153

【解析】

819+81÷9                      1000-791+209

=819+9                         =209+209

=828                           =418

(451-379)÷8                  593-(271+169)

=72÷8                          =593-440

=9                              =153