4.已知∠A为锐角且tanA=$\sqrt{3}$,则∠A=( )
| A. | 30° | B. | 45° | C. | 60° | D. | 不能确定 |
1.函数y=-x2-3的图象向上平移2个单位,再向左平移2个单位后,得到的函数是( )
| A. | y=-(x+2)2-1 | B. | y=-(x-2)2-1 | C. | y=-(x-2)2+1 | D. | y=-(x+2)2+1 |
17.若x表示一个两位数,把数字3放在x的右边,组成一个三位数是( )
0 279273 279281 279287 279291 279297 279299 279303 279309 279311 279317 279323 279327 279329 279333 279339 279341 279347 279351 279353 279357 279359 279363 279365 279367 279368 279369 279371 279372 279373 279375 279377 279381 279383 279387 279389 279393 279399 279401 279407 279411 279413 279417 279423 279429 279431 279437 279441 279443 279449 279453 279459 279467 366461
| A. | 3x | B. | 10x+3 | C. | 100x+3 | D. | 3×100+x |