如果与的和为单项式,则m与n的值为 ( ).A.m = 2,n = 3B.m = 3,n =" 4" C.m = -3,n = 2D.m = 3,n =
题型:单选题难度:简单来源:不详
如果与的和为单项式,则m与n的值为 ( ).A.m = 2,n = 3 | B.m = 3,n =" 4" | C.m = -3,n = 2 | D.m = 3,n = -2 |
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答案
B |
解析
∵2a2m-5bn+2与mab2n-2的和为单项式, ∴2a2m-5bn+2与mab2n-2是同类项, ∴2m-5=1,n+2=2n-2, 解得:m=3,n=4. 故选B. |
举一反三
已知代数式的值为9,则的值为 ( ) |
若,则的值为 . |
(m为整数且m>1) |
计算: . |
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