问题
选择题
m＞n到km≥kn，成立的条件是（ ）
A．k＞0
B．k＜0
C．k≤0
D．k≥0
答案
∵m＞n，
∴当k＞0时，mk＞nk，
当k=0时，mk=nk，
∴k≥0．
故选D．
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m＞n到km≥kn，成立的条件是（ ）
A．k＞0
B．k＜0
C．k≤0
D．k≥0
∵m＞n，
∴当k＞0时，mk＞nk，
当k=0时，mk=nk，
∴k≥0．
故选D．
| 选词填空。 | |
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