题目内容
计算:(1)
;
(2)﹣0.5+(﹣15)﹣(﹣17)﹣|﹣12|;
(3)
;
(4)﹣4×(﹣
)﹣[
×(﹣
)﹣(﹣0.5)].
(2)﹣0.5+(﹣15)﹣(﹣17)﹣|﹣12|;
(3)
(4)﹣4×(﹣
解:(1)
=﹣
﹣
﹣3
=﹣4
;
(2)﹣0.5+(﹣15)﹣(﹣17)﹣|﹣12|
=﹣0.5﹣15+17﹣12
=﹣27.5+17
=﹣10.5;
(3)
=3﹣40
=﹣37;
(4)﹣4×(﹣
)﹣[
×(﹣
)﹣(﹣0.5)]
=
﹣(﹣
+
)
=
+
﹣
=2+
=2
.
=﹣
=﹣4
(2)﹣0.5+(﹣15)﹣(﹣17)﹣|﹣12|
=﹣0.5﹣15+17﹣12
=﹣27.5+17
=﹣10.5;
(3)
=3﹣40
=﹣37;
(4)﹣4×(﹣
=
=
=2+
=2
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