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> 化简:12+1+13+2+…+199+98+1100+99.-数学
化简:12+1+13+2+…+199+98+1100+99.-数学
题目简介
化简:12+1+13+2+…+199+98+1100+99.-数学
题目详情
化简:
1
2
+1
+
1
3
+
2
+…
+
1
99
+
98
+
1
100
+
99
.
题型:解答题
难度:中档
来源:不详
答案
原式=
2
-1
(
2
+1)(
2
-1)
+
3
-
2
(
3
+
2
)(
3
-
2
)
+…+
100
-
99
(
100
+
99
)(
100
-
99
)
=
2
-1+
3
-
2
+
2
-
3
+…+
100
-
99
=
100
-1=9
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下列计算错误的是()A.14×7=72B.60
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计算8-2的结果是()A.2B.2C.6D.6-数学
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题目简介
化简:12+1+13+2+…+199+98+1100+99.-数学
题目详情
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