x1+x2 |
2 |
f(x1)+f(x2) |
2 |
A.1 | B.2 | C.3 | D.4 |
1 |
log3m |
1 |
log3n |
x1+x2 |
2 |
f(x1)+f(x2) |
2 |
x1+x2 |
2 |
lnx1+lnx2 |
2 |
x1+x2 |
2 |
x1x2 |
x1+x2 |
2 |
x1x2 |
x1+x2 |
2 |
x1x2 |
x1+x2 |
2 |
f(x1)+f(x2) |
2 |
3 |
A.①② | B.②③ | C.③④ | D.②③④ |
A.过点P垂直于平面α的直线平行于平面β |
B.过点P垂直于直线l的直线在平面α内 |
C.过点P垂直于平面β的直线在平面α内 |
D.过点P在平面α内作垂直于l的直线必垂直于平面β |
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