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> 下列计算错误的是()①2+3=5;②2+2=22;③ax-bx=(a-b)x;④18-82=9-4=1.A.1个B.2个C.3个D.4个-数学
下列计算错误的是()①2+3=5;②2+2=22;③ax-bx=(a-b)x;④18-82=9-4=1.A.1个B.2个C.3个D.4个-数学
题目简介
下列计算错误的是()①2+3=5;②2+2=22;③ax-bx=(a-b)x;④18-82=9-4=1.A.1个B.2个C.3个D.4个-数学
题目详情
下列计算错误的是( )
①
2
+
3
=
5
;②2+
2
=2
2
;③a
x
-b
x
=(a-b)
x
;④
18
-
8
2
=
9
-
4
=1.
A.1个
B.2个
C.3个
D.4个
题型:单选题
难度:偏易
来源:不详
答案
①不是同类二次根式,不能合并;
②不是同类二次根式,不能合并;
③正确;
④
18
-
8
2
=
3
3
-2
2
2
=
3
3
2
-
2
,错误;
故选C.
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题目简介
下列计算错误的是()①2+3=5;②2+2=22;③ax-bx=(a-b)x;④18-82=9-4=1.A.1个B.2个C.3个D.4个-数学
题目详情
①
答案
②不是同类二次根式,不能合并;
③正确;
④
故选C.