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> 下列运算(1)(-5)2=-5,(2)8+182=4+9,(3)32+23=55,(4)4-2=2.其中正确的个数是()A.0B.1C.2D.3-数学
下列运算(1)(-5)2=-5,(2)8+182=4+9,(3)32+23=55,(4)4-2=2.其中正确的个数是()A.0B.1C.2D.3-数学
题目简介
下列运算(1)(-5)2=-5,(2)8+182=4+9,(3)32+23=55,(4)4-2=2.其中正确的个数是()A.0B.1C.2D.3-数学
题目详情
下列运算(1)
(-5)
2
=-5,(2)
8
+
18
2
=
4
+
9
,(3)3
2
+2
3
=5
5
,(4)
4
-
2
=
2
.其中正确的个数是( )
A.0
B.1
C.2
D.3
题型:单选题
难度:偏易
来源:不详
答案
∵
(-5)
2
=5,
∴(1)错误;
∵
8
+
18
2
=
2
2
+3
2
2
=
5
2
2
,
4
+
9
=2+3=5,
∴
8
+
18
2
≠
4
+
9
,
∴(2)错误;
∵3
2
+2
3
≠5
5
,
∴(3)错误;
∵
4
-
2
=2-
2
,
∴(4)错误.
∴其中正确的个数是0个.
故选A.
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题目简介
下列运算(1)(-5)2=-5,(2)8+182=4+9,(3)32+23=55,(4)4-2=2.其中正确的个数是()A.0B.1C.2D.3-数学
题目详情
答案
∴(1)错误;
∵
∴
∴(2)错误;
∵3
∴(3)错误;
∵
∴(4)错误.
∴其中正确的个数是0个.
故选A.