12.
如图是统计一位病人的体温变化图,则这位病人在16时的体温约是( )
| A. | 37.8℃ | B. | 38℃ | C. | 38.7℃ | D. | 39.1℃ |
11.下列实数中,比-7小的数为( )
| A. | 1 | B. | 0 | C. | -6 | D. | -8 |
8.据统计结果显示,阳信县今年约有4500名学生参加中考,4500这个科学记数法可表示为( )
| A. | 4.5×102 | B. | 4.5×103 | C. | 4.5×104 | D. | 0.45×105 |
7.已知a+b=53,a-b=38,则a2-b2的值为( )
| A. | 15 | B. | 38 | C. | 53 | D. | 2014 |
6.相反数等于2的数是( )
0 294230 294238 294244 294248 294254 294256 294260 294266 294268 294274 294280 294284 294286 294290 294296 294298 294304 294308 294310 294314 294316 294320 294322 294324 294325 294326 294328 294329 294330 294332 294334 294338 294340 294344 294346 294350 294356 294358 294364 294368 294370 294374 294380 294386 294388 294394 294398 294400 294406 294410 294416 294424 366461
| A. | 2 | B. | -2 | C. | ±2 | D. | $\frac{1}{2}$ |