若點(diǎn)(m,n)在函數(shù)y=2x+1的圖象上

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    問題補(bǔ)充:單選題若點(diǎn)(m,n)在函數(shù)y=2x+1的圖象上,則2m-n的值是?
    A.2
    B.-2
    C.1
    D.-1
    答案:D