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①若f(x)單調(diào)遞增，g(x)單調(diào)遞增，則f(x)-g(x)單調(diào)遞增  ②若f(x)單調(diào)遞增，g(x)單調(diào)遞減，則f(x)-g(x)單調(diào)遞增  ③若f(x)單調(diào)遞減，g(x)單調(diào)遞增，則f(x)-g(x)單調(diào)遞減  ④若f(x)單調(diào)遞減，g(x)單調(diào)遞減，則f(x)-g(x)單調(diào)遞減

A.①③               B.①④              C.②③                D.②④

設(shè)f(x)、g(x)都是單調(diào)函數(shù)，有如下四個命題：

①若f(x)單調(diào)遞增，g(x)單調(diào)遞增，則f(x)－g(x)單調(diào)遞增；

②若f(x)單調(diào)遞增，g(x)單調(diào)遞減，則f(x)－g(x)單調(diào)遞增；

③若f(x)單調(diào)遞減，g(x)單調(diào)遞增，則f(x)－g(x)單調(diào)遞減；

④若f(x)單調(diào)遞減，g(x)單調(diào)遞減，則f(x)－g(x)單調(diào)遞減；

其中，正確的命題是………………………………………………（　　）

A.①③               

B.①④           

C.②③           

D.②④

①若f(x)單調(diào)遞增，g(x)單調(diào)遞增，則f(x)－g(x)單調(diào)遞增；

②若f(x)單調(diào)遞增，g(x)單調(diào)遞減，則f(x)－g(x)單調(diào)遞增；

③若f(x)單調(diào)遞減，g(x)單調(diào)遞增，則f(x)－g(x)單調(diào)遞減；

④若f(x)單調(diào)遞減，g(x)單調(diào)遞減，則f(x)－g(x)單調(diào)遞減.

其中，正確的命題是………………………………………………（　�。�

A.①③           

B.①④           

C.②③           

D.②④

①若f(x)單調(diào)遞增，g(x)單調(diào)遞增，則f(x)－g(x)單調(diào)遞增；

②若f(x)單調(diào)遞增，g(x)單調(diào)遞減，則f(x)－g(x)單調(diào)遞增；

③若f(x)單調(diào)遞減，g(x)單調(diào)遞增，則f(x)－g(x)單調(diào)遞減；

④若f(x)單調(diào)遞減，g(x)單調(diào)遞減，則f(x)－g(x)單調(diào)遞減.

其中，正確的命題是……………………………………………（　�。�

A.①③               

B.①④           

C.②③           

D.②④