计算: (1)计算:(2)用简便方法计算:

计算:

(1) 计算:

(2) 用简便方法计算:

答案

(1)

(2)

【解析】

【分析】

1 )先算乘方,再算乘除,最后算加减;同级运算,应按从左到右的顺序进行计算;如果有括号,要先做括号内的运算;

2 )将算式变形为( 1000 ÷ ,将除法变为乘法,再根据乘法分配律计算即可求解.

(1)

=﹣ 8

(2)

- 1000 ÷

- 1000 ×

1000×

【点睛】

本题考查了有理数的混合运算,有理数混合运算顺序:先算乘方,再算乘除,最后算加减;同级运算,应按从左到右的顺序进行计算;如果有括号,要先做括号内的运算.进行有理数的混合运算时,注意各个运算律的运用,使运算过程得到简化.

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