问题:
若a>0,a≠1,x>0,y>0,x>y,下列式子中正确的个数有( )
①log ax•log ay=log a(x+y);
②log ax-log ay=log a(x-y);
③log a
x
y
=log ax÷log ay;
④log a(xy)=log ax•log ay.
A.0个
B.1个
C.2个
D.3个
若a>0,a≠1,x>0,y>0,x>y,下列式子中正确的个数有( )
①log ax•log ay=log a(x+y);
②log ax-log ay=log a(x-y);
③log a
=log ax÷log ay;
④log a(xy)=log ax•log ay.
①log ax•log ay=log a(x+y);
②log ax-log ay=log a(x-y);
③log a
x |
y |
④log a(xy)=log ax•log ay.
A.0个 | B.1个 | C.2个 | D.3个 |
参考答案: