1 |
2 |
x1+x2 |
2 |
1 |
2 |
f(x1)+f(x2) |
2 |
x1+x2 |
2 |
x12+x22 |
2 |
x1+x2 |
2 |
x12-2x1x2+x22 |
4 |
1 |
4 |
f(x1)+f(x2) |
2 |
x1+x2 |
2 |
g(x1)+g(x2) |
2 |
1 |
2 |
1 |
2 |
x1+x2 |
2 |
1+2 |
2 |
3 |
2 |
2 |
1 |
2 |
g(x1)+g(x2) |
2 |
x1+x2 |
2 |
2 |
3 |
2 |
3 |
1 |
2 |
f(x1)+f(x2) |
2 |
x1+x2 |
2 |
1 |
2 |
2 |
3 |
2 |
3 |
2 |
3 |
x1+x2 |
2 |
1 |
2 |
2 |
3 |
x1 |
2 |
2 |
3 |
x1 |
2 |
2 |
3 |
x2 |
2 |
2 |
3 |
x2 |
2 |
1 |
2 |
2 |
3 |
x1 |
2 |
2 |
3 |
x2 |
2 |
f(x1)+f(x2) |
2 |
x1+x2 |
2 |
2 |
3 |
A.对任意x∈R,都有3x>2x | ||
B.y=(
| ||
C.若x∈R且x≠0,则log2x2=2log2x | ||
D.在同一坐标系中,y=2x与y=log2x的图象关于直线y=x对称 |
1 |
4 |
x |
1 |
2 |
A.
| B.2 | C.3 | D.5 |
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