题目内容

【题目】解答下列各题:

(1)(﹣3.6)+(+2.5)

2-32+

(3)(﹣49)﹣(+91)﹣(﹣5)+(﹣9)

4511+2

53+2+

6|1|+22.75

(7)(﹣7)﹣(﹣11)+(﹣9)﹣(+2)

8)(4+54

【答案】11.1213144495660.67785

【解析】试题分析:有理数加减混合运算的方法:有理数加减法统一成加法,据此求出每个算式的结果是多少即可.

试题解析:1)(﹣3.6++2.5

=﹣3.6+2.5

=﹣1.1

2

=

=﹣3+4

=1

3)(﹣49+91﹣5+﹣9

=﹣49﹣91﹣9+5

=﹣149+5

=﹣144

4511

=5+11

=6+3

=9

5

=

=3+3

=6

6

=

=0.4+2.75

=3.15﹣3.75

=﹣0.6

7)(﹣7﹣11+﹣9+2

=﹣7+11﹣9﹣2

=11﹣7+9+2

=11﹣18

=﹣7

8)(4+54

=4+45

=05

=5.

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