x1+x2 |
2 |
f(x1)+f(x2) |
2 |
f(x1)-f(x2) |
x1-x2 |
A.①②③④ | B.①②③ | C.②③ | D.③ |
| ||
x |
| ||
x |
1 |
x |
x1+x2 |
2 |
x1+x2 |
2 |
x1+x2 |
2 |
x1x2 |
x1+x2 |
2 |
x1x2 |
f(x1)+f(x2) |
2 |
1 |
2 |
1 |
2 |
x1x2 |
x1+x2 |
2 |
f(x1)+f(x2) |
2 |
f(x1)-f(x2) |
x1-x2 |
2x-3 |
kx2+4kx+5 |
A.1 | B.2 | C.3 | D.4 |
1 |
3 |
1 |
2 |
1 |
2 |
A.0 | B.1 | C.2 | D.4 |
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