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> 下列运算正确的是[]A.a+b-(a-b)=0B.C.(m-1)(m+2)=m2-m+2D.(-1)2009-1=2008-九年级数学
下列运算正确的是[]A.a+b-(a-b)=0B.C.(m-1)(m+2)=m2-m+2D.(-1)2009-1=2008-九年级数学
题目简介
下列运算正确的是[]A.a+b-(a-b)=0B.C.(m-1)(m+2)=m2-m+2D.(-1)2009-1=2008-九年级数学
题目详情
下列运算正确的是
[ ]
A.a+b-(a-b)=0
B.
C.(m-1)(m+2)=m
2
-m+2
D.(-1)
2009
-1=2008
题型:单选题
难度:偏易
来源:黑龙江省中考真题
答案
B
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题目简介
下列运算正确的是[]A.a+b-(a-b)=0B.C.(m-1)(m+2)=m2-m+2D.(-1)2009-1=2008-九年级数学
题目详情
B.
C.(m-1)(m+2)=m2-m+2
D.(-1)2009-1=2008
答案