题目内容
计算:
(1)﹣2+3﹣(﹣4)+(﹣1);
(2)
;
(3)
;
(4)
.
(1)﹣2+3﹣(﹣4)+(﹣1);
(2)
(3)
(4)
解:(1)﹣2+3﹣(﹣4)+(﹣1)
=(﹣2)+(+3)+(+4)+(﹣1)
=[(﹣2)+(+3)]+[(+4)+(﹣1)]
=1+3
=4
(2)
=
=6﹣1﹣
=4.3
(3)
=
=﹣1
(4)
=
=﹣4+1﹣4
=﹣7
=(﹣2)+(+3)+(+4)+(﹣1)
=[(﹣2)+(+3)]+[(+4)+(﹣1)]
=1+3
=4
(2)
=
=6﹣1﹣
=4.3
(3)
=
=﹣1
(4)
=
=﹣4+1﹣4
=﹣7
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