题目内容
【题目】解答下列各题:
(1)(﹣3.6)+(+2.5)
(2)-﹣(﹣3)﹣2+
(3)(﹣49)﹣(+91)﹣(﹣5)+(﹣9)
(4)﹣5﹣(﹣11)+2﹣(﹣)
(5)3﹣(﹣)+2+(﹣)
(6)﹣|﹣1|﹣(+2)﹣(﹣2.75)
(7)(﹣7)﹣(﹣11)+(﹣9)﹣(+2)
(8)(﹣4)﹣(+5)﹣(﹣4)
【答案】(1)﹣1.1(2)1(3)﹣144(4)9(5)6(6)﹣0.6(7)﹣7(8)﹣5
【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
(4)﹣5﹣(﹣11)
=﹣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)﹣(+5)﹣(﹣4)
=(﹣4)+4﹣5
=0﹣5
=﹣5.
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