题目内容
观察下列各式:
=
﹣
,
=
﹣
,
=
﹣![]()
…
(1)填空:
=___________.
(2)计算:
+
+
+…+
.
解:(1)
,
(2)原式=![]()
=
=
.
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题目内容
观察下列各式:
=
﹣
,
=
﹣
,
=
﹣![]()
…
(1)填空:
=___________.
(2)计算:
+
+
+…+
.
解:(1)
,
(2)原式=![]()
=
=
.