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> 下列运算正确的是()A.(-2)-2=4B.-2-2=14C.5x-2=15x2D.2(xy)-1=2xy-数学
下列运算正确的是()A.(-2)-2=4B.-2-2=14C.5x-2=15x2D.2(xy)-1=2xy-数学
题目简介
下列运算正确的是()A.(-2)-2=4B.-2-2=14C.5x-2=15x2D.2(xy)-1=2xy-数学
题目详情
下列运算正确的是( )
A.(-2)
-2
=4
B.
-
2
-2
=
1
4
C.
5
x
-2
=
1
5
x
2
D.
2(xy
)
-1
=
2
xy
题型:单选题
难度:偏易
来源:不详
答案
A、(-2)-2=
class="stub"1
(-2
)
2
=
class="stub"1
4
,故本选项错误;
B、-2-2=-
class="stub"1
2
2
=-
class="stub"1
4
,故本选项错误;
C、5x-2=
class="stub"5
x
2
,故本选项错误;
D、2(xy)-1=
class="stub"2
xy
,故本选项正确.
故选D.
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下列运算中,正确的是()A.a2•(a-3)2=
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题目简介
下列运算正确的是()A.(-2)-2=4B.-2-2=14C.5x-2=15x2D.2(xy)-1=2xy-数学
题目详情
答案
B、-2-2=-
C、5x-2=
D、2(xy)-1=
故选D.