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(2010•咸宁)下列运算正确的是A.2-3=-6B.C.a2•a3=a5D.3a+2a=...
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(2010•咸宁)下列运算正确的是( )
A.2
-3=-6
B.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADYAAAASCAYAAAAQeC39AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEoSURBVFhH7VVLDoQgDO25WHAc99zENQdh24O4
4CgdiihiMFYmzjBmSExEBft+BagyAIAkV21tL8/gCFgvBbbW8QfWylzrOo7CO+OiYp6sBjL4zi9l
a8XA0OR+oC35tP0lYN7quMkemKTRLN/IYFH8z+nwlvRaDJLhppfmcmBhE2PxNsUk5OyBesRVIX4X
iU+qCYEFCxqWuUMrbtGyLa8ohkaTjebtGxiaHJNzxQILOVN1YBIb3ZKxrVpF3kJGzw5oZqFWuJ4l
7GQw4Ya2zRrIDanwYS3yuCPdZ0WJ6kcs5qjkL8A5F2ejAlLjFO+/AaxVeu6ExfGTopOtGJWbVfsV
YPWYzJYsMjaEA45VEx2OrRR/aF0BbBoVgRqfB4zJZNUep9jikicAewHU3sTIPalmnwAAAABJRU5E
rkJggg==
)
C.a
2•a
3=a
5D.3a+2a=5a
2
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(2010•咸宁)下列运算正确的是( )
A.2-3=-6
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rkJggg==
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C.a2•a3=a5
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-
下列运算正确的是( )
A.2-3=-6
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADYAAAASCAYAAAAQeC39AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEoSURBVFhH7VVLDoQgDO25WHAc99zENQdh24O4
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rkJggg==
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C.a2•a3=a5
D.3a+2a=5a2
-
下列运算正确的是( )
A.2-3=-6
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADYAAAASCAYAAAAQeC39AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEoSURBVFhH7VVLDoQgDO25WHAc99zENQdh24O4
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a8XA0OR+oC35tP0lYN7quMkemKTRLN/IYFH8z+nwlvRaDJLhppfmcmBhE2PxNsUk5OyBesRVIX4X
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rkJggg==
)
C.a2•a3=a5
D.3a+2a=5a2
-
下列运算正确的是( )
A.a4•a2=a6
B.5a2b-3a2b=2
C.(-a3)2=a5
D.(3ab2)3=9a3b6