19.
已知:如图,已知△ABC,
(1)分别画出与△ABC关于y轴对称的图形△A1B1C1,并写出△A1B1C1各顶点坐标;
A1(0,-2)B1(-2,-4)C1(-4,-1)
(2)△ABC的面积=5.
(1)分别画出与△ABC关于y轴对称的图形△A1B1C1,并写出△A1B1C1各顶点坐标;
A1(0,-2)B1(-2,-4)C1(-4,-1)
(2)△ABC的面积=5.
14.已知|a-1|=5,则a的值为( )
0 290185 290193 290199 290203 290209 290211 290215 290221 290223 290229 290235 290239 290241 290245 290251 290253 290259 290263 290265 290269 290271 290275 290277 290279 290280 290281 290283 290284 290285 290287 290289 290293 290295 290299 290301 290305 290311 290313 290319 290323 290325 290329 290335 290341 290343 290349 290353 290355 290361 290365 290371 290379 366461
| A. | 0 | B. | -4 | C. | 6或-4 | D. | -6或4 |