题目内容
(1)12-(-18)+(-7)
(2)-
+
﹣
+
﹣1
(3)8÷(-2)2-(-4)×(-3)
(4)(
-
+
)×(-
)
(5)
(6)
(2)-
(3)8÷(-2)2-(-4)×(-3)
(4)(
(5)
(6)
解:(1) 12﹣(﹣18)+(﹣7),
=12+18﹣7,
=23;
(2)﹣
+
﹣
+
﹣1
,
=﹣
,
=﹣1+1﹣
,
=﹣
;
(3)8÷(﹣2)2﹣(﹣4)×(﹣3),
=8÷4﹣12,
=2﹣12,
=﹣10;
(4)(
﹣
+
)×(﹣
),
=(
﹣
+
)×(﹣12),
=﹣2+4﹣3,
=3;
(5)
,
=
﹣6,
=﹣
;
(6)
,
=﹣9﹣(﹣1+
)×
,
=﹣9+6,
=﹣3.
=12+18﹣7,
=23;
(2)﹣
=﹣
=﹣1+1﹣
=﹣
(3)8÷(﹣2)2﹣(﹣4)×(﹣3),
=8÷4﹣12,
=2﹣12,
=﹣10;
(4)(
=(
=﹣2+4﹣3,
=3;
(5)
=
=﹣
(6)
=﹣9﹣(﹣1+
=﹣9+6,
=﹣3.
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