题目内容
计算:(1)
;
(2)(﹣49)﹣(+91)﹣(﹣5)+(﹣9);
(3)
;
(4)
;
(5)
;
(6)
.
(2)(﹣49)﹣(+91)﹣(﹣5)+(﹣9);
(3)
(4)
(5)
(6)
解:(1)
=﹣6;
(2)(﹣49)﹣(+91)﹣(﹣5)+(﹣9)
=﹣49﹣91﹣9+5
=﹣144;
(3)
=﹣9﹣4+18
=5;
(4)
=
=
;
(5)
=﹣8﹣
﹣1
=﹣9
;
(6)
=﹣3+5﹣(﹣1)
=3.
(2)(﹣49)﹣(+91)﹣(﹣5)+(﹣9)
=﹣49﹣91﹣9+5
=﹣144;
(3)
=﹣9﹣4+18
=5;
(4)
=
=
(5)
=﹣8﹣
=﹣9
(6)
=﹣3+5﹣(﹣1)
=3.
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