18.
如图是一株美丽的勾股树,其中所有的四边形都是正方形,所有的三角形都是直角三角形,若正方形ABCD,正方形CEFG,正方形KHIJ,正方形JLMN的边长分别是3,5,2,3,则最大正方形ROPQ的面积是( )
| A. | 13 | B. | 26 | C. | 47 | D. | 94 |
17.函数y=$\frac{x}{x+2}$中,自变量x的取值范围是( )
0 282182 282190 282196 282200 282206 282208 282212 282218 282220 282226 282232 282236 282238 282242 282248 282250 282256 282260 282262 282266 282268 282272 282274 282276 282277 282278 282280 282281 282282 282284 282286 282290 282292 282296 282298 282302 282308 282310 282316 282320 282322 282326 282332 282338 282340 282346 282350 282352 282358 282362 282368 282376 366461
| A. | x>-2 | B. | x≠0 | C. | x>-2且x≠0 | D. | x≠-2 |