题目内容
计算.
(1)-5+6-7+8;
(2)
-(-
-
).
(1)-5+6-7+8;
(2)
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(1)原式=(-5-7)+(6+8)
=-12+14
=2;
(2)原式=
+
+
=
.
=-12+14
=2;
(2)原式=
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=
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