题目内容
计算题:
(1)(﹣6)+(﹣8)﹣(+6)﹣(﹣7);
(2)
;
(3)
.
(1)(﹣6)+(﹣8)﹣(+6)﹣(﹣7);
(2)
(3)
解:(1)(﹣6)+(﹣8)﹣(+6)﹣(﹣7)
=﹣6﹣8﹣6+7
=﹣20+7
=﹣13;
(2)
=
×
×4
=
;
(3)
=﹣
﹣4.5+1
+3
﹣5
=﹣5﹣1
=﹣6
=﹣6﹣8﹣6+7
=﹣20+7
=﹣13;
(2)
=
=
(3)
=﹣
=﹣5﹣1
=﹣6
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