5.
如图,直线AB,CD相交于点O,因为∠1+∠3=180°,∠2+∠3=180°,所以∠1=∠2,其推理依据是( )
| A. | 同角的余角相等 | B. | 对顶角相等 | C. | 同角的补角相等 | D. | 等角的补角相等 |
4.方程组$\left\{\begin{array}{l}{x+y=5}\\{x-y=1}\end{array}\right.$的解是( )
0 295332 295340 295346 295350 295356 295358 295362 295368 295370 295376 295382 295386 295388 295392 295398 295400 295406 295410 295412 295416 295418 295422 295424 295426 295427 295428 295430 295431 295432 295434 295436 295440 295442 295446 295448 295452 295458 295460 295466 295470 295472 295476 295482 295488 295490 295496 295500 295502 295508 295512 295518 295526 366461
| A. | $\left\{\begin{array}{l}{x=2}\\{y=3}\end{array}\right.$ | B. | $\left\{\begin{array}{l}{x=3}\\{y=2}\end{array}\right.$ | C. | $\left\{\begin{array}{l}{x=1}\\{y=4}\end{array}\right.$ | D. | $\left\{\begin{array}{l}{x=4}\\{y=1}\end{array}\right.$ |